ubuntu启动转圈，无法进入登录界面

安装卸载搜狗拼音输入法相关东西后出现启动转圈问题

当前使用的是lightdm,按网上说去切换成gdm3

（1）要在刚进入系统没显示圈圈和ubuntu时长按shift进入gurb。
（2）选择Ubuntu高级选项，enter
（3）选择recovery mode
（4）选择resume，进入命令行
（5）输入账号密码登陆
（6）输入   sudo dpkg-reconfigure gdm3
（7）选择gdm3
（8）reboot

正常进入桌面
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但使用 gdm3无法使用向日葵远程，继续折腾如何恢复使用lightdm

切换回lightdm3

 然后执行

apt-get remove ubuntu-sesion

apt-get install unity-greeter

日志信息

/var/log/lightdm/lightdm.log

[+0.00s] DEBUG: Monitoring logind for seats
[+0.00s] DEBUG: New seat added from logind: seat0
[+0.00s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.00s] DEBUG: Seat seat0: Starting
[+0.00s] DEBUG: Seat seat0: Creating greeter session
[+0.00s] DEBUG: Seat seat0: Failed to find session configuration default
[+0.00s] DEBUG: Seat seat0: Failed to create greeter session

The core problem seems to be the Failed to find session configuration default . Could be caused because the configuration set default at some point (checkout the ${HOME}/.dmrc files} but I was able to workaround the problem by using the unity-greeter package:

apt-get remove ubuntu-sesion
apt-get install unity-greeter

Made the trick. It would be great to have a more elegant solution and keep ubuntu-desktop installed.

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重启后输入密码无法登录 failed to start session

在登录界面按ctrl+alt+f1进入tty1界面并登录，之后输入命令

sudo apt update
sudo apt install ubuntu-desktop
sudo reboot