I have completed all suggested updates for 12.04 LTS after a long time of inactivity with my administrative account as the old laptop (Sony Vaio) was used by my wife only. After the update the Unity was gone (and a message like "Compiz was closed unexpectedly"). Trying every solution I found was not helpful. Eventually I upgraded to 14.04 LTS (by do-release-upgrade). When upgraded and rebooted, after logging in I get a pop-up "System problem detected". After a few seconds it comes back to login screen, and that's true for all users including guest user. I tried every suggested solution I found including changing lightdm to gdm to no avail. Again removed the Gnome desktop, problem persists. Would somebody please help to find a solution? I appreciate it.
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Set appropriate ownership to .Xauthority and .ICEauthority.
chown username:username .Xauthority
chown username:username .ICEauthority
Set permission for /tmp
sudo chmod a+wt /tmp
Restart lightdm
dpkg-reconfigure lightdm
sudo service lightdm restart
Reboot and login, this should fix your problem
If this doesn't fix your problem then remove incompatible graphics driver:
For Nvidia:
sudo nvidia-settings --uninstall
sudo apt-get remove --purge nvidia*
For amd:
sudo apt-get purge fglrx*
Rahul
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