我尝试将我的 Kubuntu 从 21.10 升级到 22.04。当我尝试通过 GUI 时，出现此错误：
我尝试使用命令行进行更新/升级，并显示 EOL 消息：
$ sudo do-release-upgrade
Checking for a new Ubuntu release
Your Ubuntu release is not supported anymore.
For upgrade information, please visit:
http://www.ubuntu.com/releaseendoflife
接下来我尝试按照说明进行操作这里，但这也导致了错误：
$ sudo apt update && sudo apt full-upgrade
Hit:1 https://apt.releases.hashicorp.com impish InRelease
Hit:2 https://brave-browser-apt-release.s3.brave.com stable InRelease
Ign:3 http://us.archive.ubuntu.com/ubuntu impish InRelease
Ign:4 http://security.ubuntu.com/ubuntu impish-security InRelease
Hit:5 http://ppa.launchpad.net/pipewire-debian/pipewire-upstream/ubuntu impish InRelease
Ign:6 http://us.archive.ubuntu.com/ubuntu impish-updates InRelease
Ign:7 http://us.archive.ubuntu.com/ubuntu impish-backports InRelease
Err:8 http://security.ubuntu.com/ubuntu impish-security Release
404 Not Found [IP: 185.125.190.36 80]
Err:9 http://us.archive.ubuntu.com/ubuntu impish Release
404 Not Found [IP: 91.189.91.38 80]
Get:10 https://download.docker.com/linux/ubuntu impish InRelease [48.9 kB]
Err:11 http://us.archive.ubuntu.com/ubuntu impish-updates Release
404 Not Found [IP: 91.189.91.38 80]
Hit:12 https://packages.microsoft.com/repos/ms-teams stable InRelease
Hit:13 https://download.sublimetext.com apt/stable/ InRelease
Err:14 http://us.archive.ubuntu.com/ubuntu impish-backports Release
404 Not Found [IP: 91.189.91.38 80]
Hit:15 http://ppa.launchpad.net/solaar-unifying/stable/ubuntu impish InRelease
Hit:16 http://repo.mysql.com/apt/ubuntu impish InRelease
Hit:17 https://packagecloud.io/AtomEditor/atom/any any InRelease
Reading package lists... Done
E: The repository 'http://security.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.
E: The repository 'http://us.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://us.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://us.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.
我如何才能将 Kubuntu 升级到下一个版本？我并不反对擦除我的计算机并从全新安装开始，但我已经自定义了我的桌面环境，并且不想重新创建它。不过，也许有一种方法可以保留此配置，使全新安装不那么痛苦？
答案1
我已经按照说明解决了这个问题这里--具体来说，似乎已经成功的方法是将/etc/apt/sources.list文件替换为使用旧的顽皮版本的文件，如下所示：
## EOL upgrade sources.list
# Required
deb http://old-releases.ubuntu.com/ubuntu/ impish main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ impish-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ impish-security main restricted universe multiverse
# Optional
#deb http://old-releases.ubuntu.com/ubuntu/ impish-backports main restricted universe multiverse
一旦我这样做了，更新/升级过程就非常顺利了，现在经过几次重新启动后，我正在 22.04 LTS 上用燃气做饭：
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy