I have also had this a couple of times on 12.04. I have updated my intel
driver to latest stable. I'm using cinnamon instead of Unity though.
$ apt-cache policy xserver-xorg-video-intel
xserver-xorg-video-intel:
Installed: 2:2.19.0-0ubuntu1~xup1
Candidate: 2:2.19.0-0ubuntu1~xup1
Version table:
*** 2:2.19.0-0ubuntu1~xup1 0
500 http://ppa.launchpad.net/ubuntu-x-swat/x-updates/ubuntu/
precise/main i386 Packages
100 /var/lib/dpkg/status
ctrl-alt-f1 or remote always works but I haven't found any way to
restore the GUI. Can only move the mouse cursor.
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https://bugs.launchpad.net/bugs/775060
Title:
Random GUI "freezes" in Natty (can only move the cursor) (might be a
segfault)
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