My ubuntu version is 23.10
sudo apt-get update
Ign:1 http://archive.canonical.com/ubuntu mantic InRelease
Err:2 http://archive.canonical.com/ubuntu mantic Release
404 Not Found [IP: **]
Hit:3 http://archive.ubuntu.com/ubuntu mantic InRelease
Hit:4 http://archive.ubuntu.com/ubuntu mantic-updates InRelease
Hit:5 http://archive.ubuntu.com/ubuntu mantic-security InRelease
Hit:6 http://archive.ubuntu.com/ubuntu mantic-backports InRelease
Reading package lists... Done
E: The repository 'http://archive.canonical.com/ubuntu mantic 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.
Could you please help? I have been trying to solve this for a long time.
