Err http://us.archive.ubuntu.com/ubuntu mantic Release(未解决)

• 更改软件源为更稳定的版本： 由于 mantic 已经过时，建议将你的系统软件源切换到 Ubuntu 24.04 LTS（长期支持版本）。你可以按照以下步骤进行：

  • 打开软件源配置文件：

    sudo nano /etc/apt/sources.list

  • 将所有出现的 "mantic" 替换为 "jammy"（Ubuntu 22.04 LTS）或 "lunar"（Ubuntu 23.04），或者如果你想直接升级到 LTS 版本，可以将其改为 "focal" 或 "lunar"。

    例如，将：

    deb http://us.archive.ubuntu.com/ubuntu mantic main restricted

    改为：

    deb http://us.archive.ubuntu.com/ubuntu focal main restricted

  • 参考

    • # See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
      # newer versions of the distribution.
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal main restricted
      # deb-src https://mirrors.shanhe.com/ubuntu focal main restricted
       
      ## Major bug fix updates produced after the final release of the
      ## distribution.
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-updates main restricted
      # deb-src https://mirrors.shanhe.com/ubuntu focal-updates main restricted
       
      ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
      ## team. Also, please note that software in universe WILL NOT receive any
      ## review or updates from the Ubuntu security team.
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal universe
      # deb-src https://mirrors.shanhe.com/ubuntu focal universe
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-updates universe
      # deb-src https://mirrors.shanhe.com/ubuntu focal-updates universe
       
      ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
      ## team, and may not be under a free licence. Please satisfy yourself as to
      ## your rights to use the software. Also, please note that software in
      ## multiverse WILL NOT receive any review or updates from the Ubuntu
      ## security team.
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal multiverse
      # deb-src https://mirrors.shanhe.com/ubuntu focal multiverse
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-updates multiverse
      # deb-src https://mirrors.shanhe.com/ubuntu focal-updates multiverse
       
      ## N.B. software from this repository may not have been tested as
      ## extensively as that contained in the main release, although it includes
      ## newer versions of some applications which may provide useful features.
      ## Also, please note that software in backports WILL NOT receive any review
      ## or updates from the Ubuntu security team.
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-backports main restricted universe multiverse
      # deb-src https://mirrors.shanhe.com/ubuntu focal-backports main restricted universe multiverse
       
      ## Uncomment the following two lines to add software from Canonical's
      ## 'partner' repository.
      ## This software is not part of Ubuntu, but is offered by Canonical and the
      ## respective vendors as a service to Ubuntu users.
      # deb http://archive.canonical.com/ubuntu focal partner
      # deb-src http://archive.canonical.com/ubuntu focal partner
       
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-security main restricted
      # deb-src https://mirrors.shanhe.com/ubuntu focal-security main restricted
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-security universe
      # deb-src https://mirrors.shanhe.com/ubuntu focal-security universe
      deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu focal-security multiverse
      # deb-src https://mirrors.shanhe.com/ubuntu focal-security multiverse

• 更新软件源： 修改完配置文件后，保存并退出，然后执行以下命令更新软件包列表：

  sudo apt update

• 执行系统升级： 如果你想将系统从 Ubuntu 23.10 (mantic) 升级到 Ubuntu 24.04 LTS，你可以按照我之前提到的升级步骤操作。

  do-release-upgrade