Comment 4 for bug 687374

Now, don't be sassy. ;-)

What I'm trying to get at is if you were trying to make system changes (e.g. install a kernel driver, do apt-get upgrade, or similar) you might be experiencing bug #562312. I suspect so, but there's not enough evidence in this bug report for me to be 100% certain.

Why don't you look at that bug and see if what you're experiencing matches that, and if the workaround there works for you.