Comment upgrader un vps sous ubuntu20 ?

Bonjour,

J'essaie d'upgrader les paquets de mon VPS sous ubuntu 20

Welcome to Ubuntu 20.10 (GNU/Linux 5.8.0-63-generic x86_64)

Quand je fais :
xxx@vps-xxxx:~$ sudo apt update
et
xxx@vps-xxxx:~$ sudo apt upgrade

Il n'y a aucun paquet qui est upgradé.
Dois-je upgrader la distribution en entier ?

Merci pour vos aides !

Christophe


xxx@vps-xxxx:~$ sudo apt update
Ign:1 http://nova.clouds.archive.ubuntu.com/ubuntu groovy InRelease
Hit:2 http://ppa.launchpad.net/ondrej/php/ubuntu groovy InRelease
Ign:3 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates InRelease
Ign:4 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-backports InRelease
Err:5 http://nova.clouds.archive.ubuntu.com/ubuntu groovy Release
404 Not Found [IP: 91.189.88.245 80]
Err:6 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-updates Release
404 Not Found [IP: 91.189.88.245 80]
Err:7 http://nova.clouds.archive.ubuntu.com/ubuntu groovy-backports Release
404 Not Found [IP: 91.189.88.245 80]
Ign:8 http://security.ubuntu.com/ubuntu groovy-security InRelease
Err:9 http://security.ubuntu.com/ubuntu groovy-security Release
404 Not Found [IP: 91.189.91.39 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.
xxx@vps-xxxx:~$ sudo apt upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
libevent-core-2.1-7 libevent-pthreads-2.1-7 libmecab2 libprotobuf-lite23 mecab-ipadic mecab-ipadic-utf8 mecab-utils
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.