Voilà :
sudo apt update
[sudo] password for frf:
Ign:1 http://fr.archive.ubuntu.com/ubuntu eoan InRelease
Ign:2 http://fr.archive.ubuntu.com/ubuntu eoan-updates InRelease
Ign:3 http://fr.archive.ubuntu.com/ubuntu eoan-backports InRelease
Err:4 http://fr.archive.ubuntu.com/ubuntu eoan Release
404 Not Found [IP: 2001:860:f70a::2 80]
Err:5 http://fr.archive.ubuntu.com/ubuntu eoan-updates Release
404 Not Found [IP: 2001:860:f70a::2 80]
Err:6 http://fr.archive.ubuntu.com/ubuntu eoan-backports Release
404 Not Found [IP: 2001:860:f70a::2 80]
Ign:7 http://security.ubuntu.com/ubuntu eoan-security InRelease
Err:8 http://security.ubuntu.com/ubuntu eoan-security Release
404 Not Found [IP: 2001:67c:1562::15 80]
Reading package lists... Done
E: The repository 'http://fr.archive.ubuntu.com/ubuntu eoan Release' does not have 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://fr.archive.ubuntu.com/ubuntu eoan-updates Release' does not have 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://fr.archive.ubuntu.com/ubuntu eoan-backports Release' does not have 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 eoan-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.
cat /etc/issue
Ubuntu 19.10 \n \l