Не могу войти в Ubuntu 16.04 [дубликат]

Ubuntu установила некоторые обновления, и после перезапуска я не могу войти в систему. кажется, принимает, но затем издает звуковой сигнал и возвращается к экрану входа в систему. Все пользователи, включая гостя, делают то же самое.

Я просматривал некоторые другие сообщения здесь и безуспешно пробовал некоторые из предложений. Я просмотрел файл .xsession-errors, но не понял ошибки:

X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  155 (GLX)
  Minor opcode of failed request:  3 (X_GLXCreateContext)
  Value in failed request:  0x0
  Serial number of failed request:  34
  Current serial number in output stream:  35
openConnection: connect: No such file or directory
cannot connect to brltty at :0
upstart: gnome-session (Unity) main process (1751) terminated with status 1
upstart: unity-settings-daemon main process (1737) killed by TERM signal
upstart: Disconnected from notified D-Bus bus
upstart: logrotate main process (1601) killed by TERM signal
upstart: update-notifier-crash (/var/crash/_usr_bin_compiz.1001.crash) main process (1669) killed by TERM signal
upstart: update-notifier-crash (/var/crash/_usr_bin_compiz.1002.crash) main process (1671) killed by TERM signal
upstart: bamfdaemon main process (1730) killed by TERM signal
upstart: hud main process (1735) killed by TERM signal
upstart: indicator-bluetooth main process (1795) killed by TERM signal
upstart: indicator-power main process (1796) killed by TERM signal
upstart: indicator-datetime main process (1797) killed by TERM signal
upstart: indicator-application main process (1844) killed by TERM signal
upstart: job window-stack-bridge failed to stop

Спасибо, Дэвид