我的服务器让我抓狂，我试图将当前的硬盘换成新的固态硬盘，然后设置 Raid 和有效的备份系统。但那是另一个问题...
我已经将当前系统复制到 SSD 中，所以我认为，这是一个备份，让我尝试放入最新的 LTS，因此执行此操作的快速命令是：
sudo do-release-upgrade
失败并显示以下消息：
Checking for a new Ubuntu release
Please install all available updates for your release before upgrading.
所以我必须：
sudo apt-get update
sudo apt-get upgrade
第一次安装了很多东西，然后就停止了，或者我不得不重新启动，我记不太清楚以前是否这样做过。现在我运行升级时出现此错误：
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt --fix-broken install' to correct these.
The following packages have unmet dependencies.
lxd : Depends: lxd-client (= 3.0.3-0ubuntu1~18.04.1) but 1:0.9 is installed
lxd-client : Depends: lxd (>= 1:0.9) but 3.0.3-0ubuntu1~18.04.1 is installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).
于是我按照消息中说的做了：
sudo apt --fix-broken install
出现新的错误：
Setting up udev (245.4-4ubuntu3.10) ...
Failed to restart udev.service: Unit systemd-udevd.service is not loaded properly: Exec format error.
See system logs and 'systemctl status udev.service' for details.
invoke-rc.d: initscript udev, action "restart" failed.
systemd-udevd.service - udev Kernel Device Manager
Loaded: error (Reason: Exec format error)
Active: inactive (dead)
Docs: man:systemd-udevd.service(8)
man:udev(7)
Aug 12 11:36:10 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 11:39:00 AtomServer systemd[1]: systemd-udevd.service: Cannot add dependency job, ignoring: Unit systemd-udevd.service is not loaded properly: Exec format error.
Aug 12 11:41:35 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 11:41:35 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 11:41:35 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 11:41:35 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:00:56 AtomServer systemd[1]: systemd-udevd.service: Cannot add dependency job, ignoring: Unit systemd-udevd.service is not loaded properly: Exec format error.
Aug 12 12:00:59 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:00:59 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:01:00 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
dpkg: error processing package udev (--configure):
installed udev package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of snapd:
snapd depends on udev; however:
Package udev is not configured yet.
dpkg: error processing package snapd (--configure):
dependency problems - leaving unconfigured
No apport report written because the error message indicates it's a follow-up error from a previous failure. Errors were encountered while processing:
udev
snapd
E: Sub-process /usr/bin/dpkg returned an error code (1)
此时我什么也做不了，阅读了几篇帖子和类似的问题，发出了一些命令，例如：
dpkg --configure -a
sudo dpkg --force-all -i /var/cache/apt/archives/udev_245.4-4ubuntu3.10_amd64.deb
同样的问题：
Setting up udev (245.4-4ubuntu3.10) ...
Failed to restart udev.service: Unit systemd-udevd.service is not loaded properly: Exec format error.
See system logs and 'systemctl status udev.service' for details.
invoke-rc.d: initscript udev, action "restart" failed.
systemd-udevd.service - udev Kernel Device Manager
Loaded: error (Reason: Exec format error)
Active: inactive (dead)
Docs: man:systemd-udevd.service(8)
man:udev(7)
Aug 12 12:00:59 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:01:00 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:09:00 AtomServer systemd[1]: systemd-udevd.service: Cannot add dependency job, ignoring: Unit systemd-udevd.service is not loaded properly: Exec format error.
Aug 12 12:10:38 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:10:38 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:10:38 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:11:50 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:11:51 AtomServer systemd[1]: systemd-udevd.service: Cannot add dependency job, ignoring: Unit systemd-udevd.service is not loaded properly: Exec format error.
Aug 12 12:11:51 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
Aug 12 12:11:51 AtomServer systemd[1]: /lib/systemd/system/systemd-udevd.service:26: Executable path is not absolute: udevadm control --reload --timeout 0
dpkg: error processing package udev (--install):
installed udev package post-installation script subprocess returned error exit status 1
Processing triggers for systemd (237-3ubuntu10.44) ...
Processing triggers for ureadahead (0.100.0-21) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Errors were encountered while processing:
udev
有什么帮助吗？
谢谢
编辑 输出 apt-get update：
Hit:1 http://gb.archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://gb.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:3 http://gb.archive.ubuntu.com/ubuntu focal-backports InRelease [101 kB]
Get:4 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Fetched 328 kB in 2s (140 kB/s)
Reading package lists... Done
答案1
更新型多巴胺：
看起来你试图安装错误的 udev 版本。对于仿生的下载并安装http://mirrors.kernel.org/ubuntu/pool/main/s/systemd/udev_237-3ubuntu10.50_amd64.deb
您可以尝试注释掉该行/lib/systemd/system/systemd-udevd.service:26 ，直到升级完成
sudo sed -i '/ExecReload/s/.*/#\0/g' /lib/systemd/system/systemd-udevd.service
sudo systemctl daemon-reload
然后尝试再次升级
sudo do-release-upgrade