背景信息

在Ubuntu 23.04操作系统上执行apt-get update命令更新操作系统时，得到以下错误

# apt-get update
Ign:1 http://mirrors.aliyun.com/ubuntu lunar InRelease
Ign:2 http://mirrors.aliyun.com/ubuntu lunar-updates InRelease
Ign:3 http://mirrors.aliyun.com/ubuntu lunar-backports InRelease
Err:4 http://mirrors.aliyun.com/ubuntu lunar Release
  404  Not Found [IP: 47.105.29.118 80]
Err:5 http://mirrors.aliyun.com/ubuntu lunar-updates Release
  404  Not Found [IP: 47.105.29.118 80]
Err:6 http://mirrors.aliyun.com/ubuntu lunar-backports Release
  404  Not Found [IP: 47.105.29.118 80]
Ign:7 http://security.ubuntu.com/ubuntu lunar-security InRelease
Err:8 http://security.ubuntu.com/ubuntu lunar-security Release
  404  Not Found [IP: 185.125.190.83 80]
Reading package lists... Done
E: The repository 'http://mirrors.aliyun.com/ubuntu lunar 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://mirrors.aliyun.com/ubuntu lunar-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://mirrors.aliyun.com/ubuntu lunar-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 lunar-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.
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