我正在尝试$ sudo apt update但我得到了这个：
Reading package lists... Done
E: The repository 'http://archive.ubuntu.com/ubuntu impish 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://archive.ubuntu.com/ubuntu impish-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://archive.ubuntu.com/ubuntu impish-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://archive.ubuntu.com/ubuntu impish-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.
我没有碰过Software & updates - other software手术室，sources.list以防有人问起。
确切的 Ubuntu 版本。
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 21.10
Release: 21.10
Codename: impish
已编辑：这个问题是关于 22.04 的，而不是关于 21.10 的，感谢您没有关闭它。
答案1
自 7 月 14 日起，Ubuntu 21.10“Impish Indri”不再有 Canonical 更新，这就是您无法更新的原因。
您可以继续使用 21.10，但可能会存在安全漏洞等风险，这些漏洞将不再得到修补，但我建议升级到最新的 22.04“Jammy Jellyfish”LTE
以下是 EOL 之后的升级方法： https://help.ubuntu.com/community/EOLUpgrades