I'm still on 11.10 and I'm having a similar problem.
I'm back at work after a long weekend (Monday was a holiday here) and did a system update. Off the top of my head I remember there being a ubuntu-minimum (or something similar) and a bunch of vim updates.
I haven't been paying attention to the timing, but twice so far this morning my machine has quite suddenly dumped me to the lightdm login screen. I use Gnome Shell (rather than Unity.) Both times it's happened I've been actively using my computer.
Once I'm back at the login screen I'm unable to get to a tty login using ctrl-alt-f1. My monitor says "no signal." Going back to X (ctrl-alt-f7) works. I've rebooted after each incident this morning.
This is going to make it hard to get much work done today.
Here is a list of updates I applied this morning:
Code:
Setting up vim-common (2:7.3.154+hg~74503f6ee649-2ubuntu3.1) ...
Setting up vim-runtime (2:7.3.154+hg~74503f6ee649-2ubuntu3.1) ...
Setting up vim (2:7.3.154+hg~74503f6ee649-2ubuntu3.1) ...
Setting up vim-gui-common (2:7.3.154+hg~74503f6ee649-2ubuntu3.1) ...
Setting up vim-gnome (2:7.3.154+hg~74503f6ee649-2ubuntu3.1) ...
Setting up vim-tiny (2:7.3.154+hg~74503f6ee649-2ubuntu3.1) ...
Setting up ubuntu-minimal (1.245.1) ...
Setting up ubuntu-standard (1.245.1) ...
Setting up python-desktopcouch-records (1.0.8-0ubuntu1.1) ...
Setting up python-desktopcouch-application (1.0.8-0ubuntu1.1) ...
Setting up desktopcouch (1.0.8-0ubuntu1.1) ...
Setting up libmission-control-plugins0 (1:5.9.1-0ubuntu2.1) ...
Setting up telepathy-mission-control-5 (1:5.9.1-0ubuntu2.1) ...
Setting up ubuntu-desktop (1.245.1) ...
Setting up libxml2 (2.7.8.dfsg-4ubuntu0.3) ...
Setting up libxml2-dev (2.7.8.dfsg-4ubuntu0.3) ...
Setting up libxml2-utils (2.7.8.dfsg-4ubuntu0.3) ...
Setting up python-libxml2 (2.7.8.dfsg-4ubuntu0.3) ...
...
10:30. Had another crash. This time after about 15 minutes. Instead of dumping me to lightdm the screen froze. I could move the cursor but the computer was unresponsive to clicks and keyboard. I was able to ssh from another machine to issue reboot.
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