I have a problem logging into Ubuntu under all of my usernames. I have tried many solutions. When I look at my .xsession-errors file, I get the following:
xlib: extension "GLX" missing on display ":o"
Script for ibus started at run_im.
Script for auto started at run_im.
Script for default started at run_im.
init: gnome-session (unity) main process (2292) terminated with status 1
init: unity-settings-deamon main process (2284) killed by TERM signal
init: logrotate main process (2192)killed by TERM signal
init: update-notifier-crash (/var/crash/_usr_bin_compiz.1000.crash) main process (2230) killed by TERM signal
init: xsession-init main process (2201) killed by TERM signal
init: hud main process (2288) killed by TERM signal
init: unity=panel service main process (2299) killed by TERM signal
init: Disconnected from notified D-Bus bus
init: window-stack-bridge main process (2215) killed by KILL signal
ctrl
+alt
+F2
to drop to a command shell, login, and then runsudo apt-get remove --purge lightdm
and thensudo apt-get install lightdm
. If that doesn't work, trysudo apt-get install gdm
.