You have been subscribed to a public bug: The problems is stated and detailed in this link: http://ubuntuforums.org/showthread.php?p=11909461 There's the full ubuntuforums's thread for further details. I'll let just a few words about it here.
I have an unstable system after upgrading from 10.04 to 12.04. On undetermined conditions, my system abruptly logs out and it is showed to me again the login screen: no warnings, no error messages. This all happens in an instant: one second i'm working, the next one there's the login screen. After logging in again, all my work is lost, all programs were automaticaly closed. The only time-matching problem i've found in the logs is in "apport.log": recurrent unhandled exceptions at exactly the same time my system logs out. ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: exception invalid process unhandled -- Session end (back to login screen) on apport unhandled exception https://bugs.launchpad.net/bugs/995294 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp