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Ubuntu 12.04 does not start x after boot up. Worked until now without any problem, and last shutdown was clean.
After text log in I can run startx, but no tray and Alt+Tab does not working.
Command startx run my default gnome classic and gnome statup scripts also runs.
How to restore to start X automatically?
After boot,try to start desktop manager:
sudo service lightdm start
then check if lightdm is default desktop manager:
cat /etc/X11/default-display-manager
if not, edit file with:
/usr/sbin/lightdm (or /usr/bin/lightdm)
Reboot and lightdm should start.
sudo service lightdm start start up my X as expected with panels and all customization working. File /etc/X11/default-display-manager contains /usr/sbin/lightdm, needed not to change anything. The executable file exist in that folder. After reboot X does not start automatically, still requires to manually sudo service lightdm start. How to make lightdm service to start automatically ?
sudo dpkg-reconfigure lightdm. If not working, try to delay startup of lightdm: in /etc/init/lightdm.conf before command exec lightdm add sleep 2 (or more). It seems to be a issue related of use of SSD.
Jun 1 '13 at 14:51