Upgrade from Ubuntu 20.10 to Ubuntu 21.04

Hi,

I have received an email from OVH informing me that the Ubuntu 20.10 images for VPS are reaching end of life, and suggesting me to upgrade distribution to Ubuntu 21.04.

I have a VPS with Ubuntu 20.10 distribution.

I followed this guide (https://docs.ovh.com/gb/en/public-cloud/upgrading-operating-system/) to upgrade distribution from Ubuntu 20.10 to Ubuntu 21.04.

But I am getting error messages when trying to update and upgrade packages and distribution. I am posting the commands and the results below:

`$ sudo apt-get update` returns:

Ign:1 http://nova.clouds.archive.ubuntu.com/ubuntu groovy InRelease
Ign:2 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates InRelease
Ign:3 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-backports InRelease
Err:4 http://nova.clouds.archive.ubuntu.com/ubuntu groovy Release
404 Not Found [IP: 91.189.88.245 80]
Err:5 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates Release
404 Not Found [IP: 91.189.88.245 80]
Err:6 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-backports Release
404 Not Found [IP: 91.189.88.245 80]
Ign:7 http://security.ubuntu.com/ubuntu groovy-security InRelease
Err:8 http://security.ubuntu.com/ubuntu groovy-security Release
404 Not Found [IP: 91.189.91.38 80]
Reading package lists... Done
E: The repository 'http://nova.clouds.archive.ubuntu.com/ubuntu groovy Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://nova.clouds.archive.ubuntu.com/ubuntu groovy-backports Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://security.ubuntu.com/ubuntu groovy-security Release' no longer has a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

`$ sudo apt-get upgrade -y` returns:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
ubuntu-advantage-tools
The following packages will be upgraded:
alsa-ucm-conf apt apt-utils cloud-init fwupd fwupd-signed initramfs-tools
initramfs-tools-bin initramfs-tools-core landscape-common libapt-pkg6.0
libasound2 libasound2-data libfwupd2 libfwupdplugin1 libnetplan0
libopeniscsiusr0.2.0 libpam-modules libpam-modules-bin libpam-runtime
libpam0g libprocps8 libseccomp2 libssl1.1 libxmlb1 netplan.io open-iscsi
open-vm-tools openssl procps python-apt-common python3-apt
python3-distupgrade python3-update-manager snapd sosreport
ubuntu-release-upgrader-core update-manager-core
38 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 39.7 MB of archives.
After this operation, 7063 kB of additional disk space will be used.
Err:1 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libapt-pkg6.0 amd64 2.1.10ubuntu0.3
404 Not Found [IP: 91.189.88.246 80]
Err:2 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 apt amd64 2.1.10ubuntu0.3
404 Not Found [IP: 91.189.88.246 80]
Err:3 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 apt-utils amd64 2.1.10ubuntu0.3
404 Not Found [IP: 91.189.88.246 80]
Err:4 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libseccomp2 amd64 2.5.1-1ubuntu1~20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:5 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam0g amd64 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:6 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam-modules-bin amd64 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:7 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam-modules amd64 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:8 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libopeniscsiusr0.2.0 amd64 2.1.1-1ubuntu2.1
404 Not Found [IP: 91.189.88.246 80]
Err:9 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 open-iscsi amd64 2.1.1-1ubuntu2.1
404 Not Found [IP: 91.189.88.246 80]
Err:10 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam-runtime all 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:11 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libssl1.1 amd64 1.1.1f-1ubuntu4.4
404 Not Found [IP: 91.189.88.246 80]
Err:12 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libprocps8 amd64 2:3.3.16-5ubuntu2.2
404 Not Found [IP: 91.189.88.246 80]
Err:13 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 procps amd64 2:3.3.16-5ubuntu2.2
404 Not Found [IP: 91.189.88.246 80]
Err:14 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libnetplan0 amd64 0.102-0ubuntu1~20.10.3
404 Not Found [IP: 91.189.88.246 80]
Err:15 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 initramfs-tools all 0.137ubuntu12.1
404 Not Found [IP: 91.189.88.246 80]
Err:16 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 initramfs-tools-core all 0.137ubuntu12.1
404 Not Found [IP: 91.189.88.246 80]
Err:17 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 initramfs-tools-bin amd64 0.137ubuntu12.1
404 Not Found [IP: 91.189.88.246 80]
Err:18 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 netplan.io amd64 0.102-0ubuntu1~20.10.3
404 Not Found [IP: 91.189.88.246 80]
Err:19 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 openssl amd64 1.1.1f-1ubuntu4.4
404 Not Found [IP: 91.189.88.246 80]
Err:20 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python-apt-common all 2.1.3ubuntu1.4
404 Not Found [IP: 91.189.88.246 80]
Err:21 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python3-apt amd64 2.1.3ubuntu1.4
404 Not Found [IP: 91.189.88.246 80]
Err:22 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 ubuntu-release-upgrader-core all 1:20.10.16
404 Not Found [IP: 91.189.88.246 80]
Err:23 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python3-distupgrade all 1:20.10.16
404 Not Found [IP: 91.189.88.246 80]
Err:24 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python3-update-manager all 1:20.10.6
404 Not Found [IP: 91.189.88.246 80]
Err:25 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 update-manager-core all 1:20.10.6
404 Not Found [IP: 91.189.88.246 80]
Err:26 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 alsa-ucm-conf all 1.2.2-1ubuntu5.2
404 Not Found [IP: 91.189.88.246 80]
Err:27 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 fwupd-signed amd64 1.30.2+1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:28 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libfwupd2 amd64 1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:29 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libxmlb1 amd64 0.1.15-2ubuntu1~20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:30 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libfwupdplugin1 amd64 1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:31 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 fwupd amd64 1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:32 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 landscape-common amd64 19.12-0ubuntu5.1
404 Not Found [IP: 91.189.88.246 80]
Err:33 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libasound2 amd64 1.2.3.2-1ubuntu3.2
404 Not Found [IP: 91.189.88.246 80]
Err:34 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libasound2-data all 1.2.3.2-1ubuntu3.2
404 Not Found [IP: 91.189.88.246 80]
Err:35 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 snapd amd64 2.49.2+20.10
404 Not Found [IP: 91.189.88.246 80]
Err:36 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 sosreport amd64 4.1-1ubuntu0.20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:37 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 cloud-init all 21.2-3-g899bfaa9-0ubuntu2~20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:38 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 open-vm-tools amd64 2:11.2.5-2ubuntu1~ubuntu20.10.1
404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/apt/libapt-pkg6.0_2.1.10ubuntu0.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/apt/apt_2.1.10ubuntu0.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/apt/apt-utils_2.1.10ubuntu0.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/libs/libseccomp/libseccomp2_2.5.1-1ubuntu1~20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam0g_1.3.1-5ubuntu6.20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam-modules-bin_1.3.1-5ubuntu6.20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam-modules_1.3.1-5ubuntu6.20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/open-iscsi/libopeniscsiusr0.2.0_2.1.1-1ubuntu2.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/open-iscsi/open-iscsi_2.1.1-1ubuntu2.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam-runtime_1.3.1-5ubuntu6.20.10.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1f-1ubuntu4.4_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/procps/libprocps8_3.3.16-5ubuntu2.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/procps/procps_3.3.16-5ubuntu2.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/n/netplan.io/libnetplan0_0.102-0ubuntu1~20.10.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/i/initramfs-tools/initramfs-tools_0.137ubuntu12.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/i/initramfs-tools/initramfs-tools-core_0.137ubuntu12.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/i/initramfs-tools/initramfs-tools-bin_0.137ubuntu12.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/n/netplan.io/netplan.io_0.102-0ubuntu1~20.10.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_1.1.1f-1ubuntu4.4_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/python-apt/python-apt-common_2.1.3ubuntu1.4_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/python-apt/python3-apt_2.1.3ubuntu1.4_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/ubuntu-release-upgrader/ubuntu-release-upgrader-core_20.10.16_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/ubuntu-release-upgrader/python3-distupgrade_20.10.16_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/update-manager/python3-update-manager_20.10.6_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/update-manager/update-manager-core_20.10.6_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/alsa-ucm-conf/alsa-ucm-conf_1.2.2-1ubuntu5.2_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd-signed/fwupd-signed_1.30.2+1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd/libfwupd2_1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/libx/libxmlb/libxmlb1_0.1.15-2ubuntu1~20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd/libfwupdplugin1_1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd/fwupd_1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/l/landscape-client/landscape-common_19.12-0ubuntu5.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/alsa-lib/libasound2_1.2.3.2-1ubuntu3.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/alsa-lib/libasound2-data_1.2.3.2-1ubuntu3.2_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/s/snapd/snapd_2.49.2+20.10_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/s/sosreport/sosreport_4.1-1ubuntu0.20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/c/cloud-init/cloud-init_21.2-3-g899bfaa9-0ubuntu2~20.10.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/open-vm-tools/open-vm-tools_11.2.5-2ubuntu1~ubuntu20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

`$ sudo apt-get dist-upgrade -y` returns:

Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following NEW packages will be installed:
distro-info
The following packages will be upgraded:
alsa-ucm-conf apt apt-utils cloud-init fwupd fwupd-signed initramfs-tools
initramfs-tools-bin initramfs-tools-core landscape-common libapt-pkg6.0
libasound2 libasound2-data libfwupd2 libfwupdplugin1 libnetplan0
libopeniscsiusr0.2.0 libpam-modules libpam-modules-bin libpam-runtime
libpam0g libprocps8 libseccomp2 libssl1.1 libxmlb1 netplan.io open-iscsi
open-vm-tools openssl procps python-apt-common python3-apt
python3-distupgrade python3-update-manager snapd sosreport
ubuntu-advantage-tools ubuntu-release-upgrader-core update-manager-core
39 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 40.6 MB of archives.
After this operation, 10.0 MB of additional disk space will be used.
Err:1 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libapt-pkg6.0 amd64 2.1.10ubuntu0.3
404 Not Found [IP: 91.189.88.246 80]
Err:2 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 apt amd64 2.1.10ubuntu0.3
404 Not Found [IP: 91.189.88.246 80]
Err:3 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 apt-utils amd64 2.1.10ubuntu0.3
404 Not Found [IP: 91.189.88.246 80]
Err:4 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libseccomp2 amd64 2.5.1-1ubuntu1~20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:5 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam0g amd64 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:6 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam-modules-bin amd64 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:7 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam-modules amd64 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:8 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libopeniscsiusr0.2.0 amd64 2.1.1-1ubuntu2.1
404 Not Found [IP: 91.189.88.246 80]
Err:9 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 open-iscsi amd64 2.1.1-1ubuntu2.1
404 Not Found [IP: 91.189.88.246 80]
Err:10 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libpam-runtime all 1.3.1-5ubuntu6.20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:11 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libssl1.1 amd64 1.1.1f-1ubuntu4.4
404 Not Found [IP: 91.189.88.246 80]
Err:12 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libprocps8 amd64 2:3.3.16-5ubuntu2.2
404 Not Found [IP: 91.189.88.246 80]
Err:13 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 procps amd64 2:3.3.16-5ubuntu2.2
404 Not Found [IP: 91.189.88.246 80]
Err:14 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libnetplan0 amd64 0.102-0ubuntu1~20.10.3
404 Not Found [IP: 91.189.88.246 80]
Err:15 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 initramfs-tools all 0.137ubuntu12.1
404 Not Found [IP: 91.189.88.246 80]
Err:16 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 initramfs-tools-core all 0.137ubuntu12.1
404 Not Found [IP: 91.189.88.246 80]
Err:17 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 initramfs-tools-bin amd64 0.137ubuntu12.1
404 Not Found [IP: 91.189.88.246 80]
Err:18 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 netplan.io amd64 0.102-0ubuntu1~20.10.3
404 Not Found [IP: 91.189.88.246 80]
Err:19 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 openssl amd64 1.1.1f-1ubuntu4.4
404 Not Found [IP: 91.189.88.246 80]
Get:20 http://nova.clouds.archive.ubuntu.com/ubuntu groovy/main amd64 distro-info amd64 0.23ubuntu1 [17.1 kB]
Err:21 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 ubuntu-advantage-tools amd64 27.1~20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:22 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python-apt-common all 2.1.3ubuntu1.4
404 Not Found [IP: 91.189.88.246 80]
Err:23 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python3-apt amd64 2.1.3ubuntu1.4
404 Not Found [IP: 91.189.88.246 80]
Err:24 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 ubuntu-release-upgrader-core all 1:20.10.16
404 Not Found [IP: 91.189.88.246 80]
Err:25 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python3-distupgrade all 1:20.10.16
404 Not Found [IP: 91.189.88.246 80]
Err:26 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 python3-update-manager all 1:20.10.6
404 Not Found [IP: 91.189.88.246 80]
Err:27 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 update-manager-core all 1:20.10.6
404 Not Found [IP: 91.189.88.246 80]
Err:28 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 alsa-ucm-conf all 1.2.2-1ubuntu5.2
404 Not Found [IP: 91.189.88.246 80]
Err:29 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 fwupd-signed amd64 1.30.2+1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:30 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libfwupd2 amd64 1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:31 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libxmlb1 amd64 0.1.15-2ubuntu1~20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:32 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libfwupdplugin1 amd64 1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:33 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 fwupd amd64 1.4.7-0~20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:34 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 landscape-common amd64 19.12-0ubuntu5.1
404 Not Found [IP: 91.189.88.246 80]
Err:35 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libasound2 amd64 1.2.3.2-1ubuntu3.2
404 Not Found [IP: 91.189.88.246 80]
Err:36 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 libasound2-data all 1.2.3.2-1ubuntu3.2
404 Not Found [IP: 91.189.88.246 80]
Err:37 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 snapd amd64 2.49.2+20.10
404 Not Found [IP: 91.189.88.246 80]
Err:38 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 sosreport amd64 4.1-1ubuntu0.20.10.2
404 Not Found [IP: 91.189.88.246 80]
Err:39 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 cloud-init all 21.2-3-g899bfaa9-0ubuntu2~20.10.1
404 Not Found [IP: 91.189.88.246 80]
Err:40 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates/main amd64 open-vm-tools amd64 2:11.2.5-2ubuntu1~ubuntu20.10.1
404 Not Found [IP: 91.189.88.246 80]
Fetched 17.1 kB in 0s (125 kB/s)
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/apt/libapt-pkg6.0_2.1.10ubuntu0.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/apt/apt_2.1.10ubuntu0.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/apt/apt-utils_2.1.10ubuntu0.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/libs/libseccomp/libseccomp2_2.5.1-1ubuntu1~20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam0g_1.3.1-5ubuntu6.20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam-modules-bin_1.3.1-5ubuntu6.20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam-modules_1.3.1-5ubuntu6.20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/open-iscsi/libopeniscsiusr0.2.0_2.1.1-1ubuntu2.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/open-iscsi/open-iscsi_2.1.1-1ubuntu2.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/pam/libpam-runtime_1.3.1-5ubuntu6.20.10.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1f-1ubuntu4.4_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/procps/libprocps8_3.3.16-5ubuntu2.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/procps/procps_3.3.16-5ubuntu2.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/n/netplan.io/libnetplan0_0.102-0ubuntu1~20.10.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/i/initramfs-tools/initramfs-tools_0.137ubuntu12.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/i/initramfs-tools/initramfs-tools-core_0.137ubuntu12.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/i/initramfs-tools/initramfs-tools-bin_0.137ubuntu12.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/n/netplan.io/netplan.io_0.102-0ubuntu1~20.10.3_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/openssl/openssl_1.1.1f-1ubuntu4.4_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/ubuntu-advantage-tools/ubuntu-advantage-tools_27.1~20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/python-apt/python-apt-common_2.1.3ubuntu1.4_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/p/python-apt/python3-apt_2.1.3ubuntu1.4_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/ubuntu-release-upgrader/ubuntu-release-upgrader-core_20.10.16_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/ubuntu-release-upgrader/python3-distupgrade_20.10.16_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/update-manager/python3-update-manager_20.10.6_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/u/update-manager/update-manager-core_20.10.6_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/alsa-ucm-conf/alsa-ucm-conf_1.2.2-1ubuntu5.2_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd-signed/fwupd-signed_1.30.2+1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd/libfwupd2_1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/libx/libxmlb/libxmlb1_0.1.15-2ubuntu1~20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd/libfwupdplugin1_1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/f/fwupd/fwupd_1.4.7-0~20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/l/landscape-client/landscape-common_19.12-0ubuntu5.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/alsa-lib/libasound2_1.2.3.2-1ubuntu3.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/a/alsa-lib/libasound2-data_1.2.3.2-1ubuntu3.2_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/s/snapd/snapd_2.49.2+20.10_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/s/sosreport/sosreport_4.1-1ubuntu0.20.10.2_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/c/cloud-init/cloud-init_21.2-3-g899bfaa9-0ubuntu2~20.10.1_all.deb 404 Not Found [IP: 91.189.88.246 80]
E: Failed to fetch http://nova.clouds.archive.ubuntu.com/ubuntu/pool/main/o/open-vm-tools/open-vm-tools_11.2.5-2ubuntu1~ubuntu20.10.1_amd64.deb 404 Not Found [IP: 91.189.88.246 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

And `$ sudo do-release-upgrade` returns:

Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
http://www.ubuntu.com/releaseendoflife

Please install all available updates for your release before upgrading.

Any idea what I should do?

Many thanks in advance.

Best,
Thibaut