Comment 1 for bug 366927

Thank you for taking the time to report this bug and helping to make Ubuntu better.
Unfortunately, we can't fix it because your description didn't include enough information.

Next time this happens,
Iif Possible,
can you switch to a text console by hitting
CTRL + ALT + F1, login there, and then run
apport-collect -p linux 366927

This will gather a lot of debugging information related to your issue.
To run apport-collect you may need to install the package python-launchpadlib
(apt-get install pythonplaunchpadlib)

Thanks in advance