有什么办法可以恢复吗？我的 ubuntu 版本是 16.04
.xsession-errors 的错误是
Xlib: extension "GLX" missing on display ":0".
openConnection: connect: No such file or directory
cannot connect to brltty at :0
upstart: gnome-session (Unity) main process (2254) terminated with status 1
upstart: unity-settings-daemon main process (2245) killed by TERM signal
upstart: Disconnected from notified D-Bus bus
upstart: logrotate main process (2082) killed by TERM signal
upstart: bamfdaemon main process (2173) killed by TERM signal
upstart: hud main process (2243) killed by TERM signal
upstart: indicator-messages main process (2293) killed by TERM signal
upstart: indicator-bluetooth main process (2294) killed by TERM signal
upstart: indicator-power main process (2295) killed by TERM signal
upstart: indicator-session main process (2300) killed by TERM signal
upstart: indicator-datetime main process (2296) killed by TERM signal
upstart: indicator-printers main process (2299) killed by TERM signal
upstart: unity-panel-service main process (2261) killed by TERM signal
upstart: indicator-keyboard main process (2297) killed by TERM signal
upstart: indicator-sound main process (2298) killed by TERM signal
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