我使用的是 Ubuntu 23.04。运行时sudo apt update总是显示以下错误消息。
Ign:1 http://archive.canonical.com/ubuntu lunar InRelease
Hit:2 http://archive.ubuntu.com/ubuntu lunar InRelease
Err:3 http://archive.canonical.com/ubuntu lunar Release
404 Not Found [IP: 185.125.188.12 80]
Hit:4 http://archive.ubuntu.com/ubuntu lunar-updates InRelease
Hit:5 http://archive.ubuntu.com/ubuntu lunar-security InRelease
Hit:6 http://archive.ubuntu.com/ubuntu lunar-backports InRelease
Reading package lists... Done
E: The repository 'http://archive.canonical.com/ubuntu lunar 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.