"I have downgraded xserver-xorg-core and xserver-common but the problem persists."
xserver-xorg-video-intel is the most likely package, of those that have been upgraded, to have caused this problem. Did you try downgrading that? "I have also managed to downgrade libimobiledevice2 and libdvdread4 but all the kerberos stuff is blocked for downgrade by Bug 878263." That is unlikely to pertain to the video problem that this bug is about. ** Changed in: xorg-server (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/878235 Title: System unusable after update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/878235/+subscriptions _______________________________________________ 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