I'm having similar issues. The PC in question has Geforce 6100 onboard graphics. It was previously running Ubuntu 14.04 without any issues.
I then upgraded the install to 16.04. With nouveau, the system doesn't run stable. As soon as there is a little bit of load, I get diagonal stripes on the monitor (see http://i.imgur.com/X3Am8U2.jpg) and it appears to lock up (can't switch to text console either). I tried a fresh install of 16.04, switching from i686 to amd-x64 in the process. The lockups with the diagonal stripes remain. So I tried nvidia-304 instead. Lots of problems there. First I get X11 with just the desktop and no menus and launchers. Then I got black screen with just the mouse pointer. Currently, I get a desktop but with massive screen corruption. I am also getting the errors that were reported in comment #2. -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers-304-updates in Ubuntu. https://bugs.launchpad.net/bugs/1579501 Title: graphics distorted, lightdm restarting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-304-updates/+bug/1579501/+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
