就在发生这种情况之前，我正在使用 conda（和 sudo）更新一些软件包，还为 jupyter notebook 安装了一些插件（不知道这些是否与我的问题有关）。由于我的磁盘已满（/ 目录的使用率为 100%），所以出现了问题。我以为这是错误的，因为我刚刚删除了一些东西，所以我重新启动了。现在，当我进入 ubuntu GUI 中的登录屏幕时，当我输入密码并按回车键时，GUI 会像往常一样消失，但 3 秒后，它会发出笨拙的“错误”声音并返回。我仍然可以使用 control alt F1 登录到终端窗口。当我尝试登录到访客帐户（甚至没有密码）时，也会发生此登录循环。
我已尝试过的方法（均未能解决问题）：
- Freed up disk space (I used sudo apt-get autoremove; I now have under 80% usage on all my drives)
- Restarting lightdm
- Removed /var/crash/*
- sudo chmod 777 ~/.ICEauthority
- sudo apt-get purge nvidia-*
- chown username:username .Xauthority
- purging and reinstall lightdm
- Checking PATH in ~/.profile (PATH="$HOME/bin:$HOME/.local/bin:$PATH" looks normal to me)
- rebooted after all these steps
我的.xsession-errors 文件是：
X Error of failed request: BadValue (integer parameter out of range for operation)
Major opcode of failed request: 154 (GLX)
Minor opcode of failed request: 3 (X_GLXCreateContext)
Value in failed request: 0x0
Serial number of failed request: 30
Current serial number in output stream: 31
openConnection: connect: No such file or directory
cannot connect to brltty at :0
upstart: gnome-session (Unity) main process (1848) terminated with status 1
upstart: unity-settings-daemon main process (1840) killed by TERM signal
upstart: Disconnected from notified D-Bus bus
upstart: logrotate main process (1679) killed by TERM signal
upstart: hud main process (1838) killed by TERM signal
upstart: bamfdaemon main process (1771) killed by TERM signal
upstart: indicator-bluetooth main process (1904) killed by TERM signal
upstart: indicator-power main process (1905) killed by TERM signal
upstart: indicator-application main process (1944) killed by TERM signal
说实话，我不太清楚这些事情意味着什么。
编辑：在 ask ubuntu 和 reddit 上尝试了各种方法大约六个小时后，我仍然无法获得它。所以我只是重新安装了操作系统（好吧，我安装了当前版本，20. 左右）。