我进行了 HWE 升级，一切正常。系统启动正常。但我运行了 Ubuntu Tweak，它报告了大量垃圾。所以我运行了 Janitor，哦哦……系统启动到命令行终端。经过研究，我发现 lightdm 没有启动，通过安装并切换到 gdm 恢复了桌面。我想了解问题并恢复 lightdm，但一天的努力并没有让我取得成功。
我正在将此系统作为无头盒运行，它没有专有驱动程序。
我的目标是重新获得 lightdm，有人可以建议一种方法吗？
这是我的 lightdm 日志：
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.2.3, UID=0 PID=1744
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registered seat module xlocal
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Adding default seat
[+0.00s] DEBUG: Starting seat
[+0.00s] DEBUG: Starting new display for automatic login as user bill
[+0.00s] DEBUG: Starting local X display
[+0.00s] DEBUG: Using VT 7
[+0.00s] DEBUG: Activating VT 7
[+0.10s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+0.11s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+0.11s] DEBUG: Launching X Server
[+0.11s] DEBUG: Launching process 1749: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.11s] DEBUG: Waiting for ready signal from X server :0
[+0.12s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.12s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.12s] DEBUG: Process 1749 exited with return value 1
[+0.12s] DEBUG: X server stopped
[+0.12s] DEBUG: Removing X server authority /var/run/lightdm/root/:0
[+0.12s] DEBUG: Releasing VT 7
[+0.12s] DEBUG: Display server stopped
[+0.12s] DEBUG: Stopping display
[+0.12s] DEBUG: Display stopped
[+0.12s] DEBUG: Stopping X local seat, failed to start a display
[+0.12s] DEBUG: Stopping seat
[+[+1057.81s] DEBUG: Got signal 15 from process 1
[+1057.81s] DEBUG: Caught Terminated signal, shutting down
[+1057.81s] DEBUG: Stopping display manager
[+1057.81s] DEBUG: Display manager stopped
[+1057.81s] DEBUG: Stopping daemon
[+1057.82s] DEBUG: Exiting with return value 0
答案1
幸运的是，我有一个可以与之比较的工作系统。Ubuntu Tweak 出于某种原因删除了 /etc/X11 中的符号链接，这导致 lightdm 失败。
修复方法很简单：
cd /etc/X11
sudo ln -s /usr/bin/Xorg X
鲍勃是你的叔叔。