I'm getting random freezing issues on my PC running 12.04 (Core i5 3450 w/ integrated graphics) and haven't been able to pinpoint the exact cause of the problem. However I have been getting "Sorry, Ubuntu 12.04 has experienced an internal error" messages regarding "Xorg".
Here's a screenshot of the error window: http://i.imgur.com/5nh5B.png
This is on a clean install of Ubuntu as well. One thing I noticed is these issues start happening the moment I connect my PC to the Internet and attempt to install updates which always results in an error.
Here's a screenshot of the update manager error: http://i.imgur.com/2fGk4.png
Any ideas on what could be causing this issue? Thanks for any help.