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I've seen a similar problem on university networks in the past. Does it occur primarily during downloads? If so, it could be on the university's end.

Really, the key thing we need to know is: Does...

Thanks, please note the time on your computer before attempting a shutdown. Then, after the hang, reboot and run these commands:

cat /var/log/messages > ~/Desktop/messages.txt
cat /var/log/syslog...

They could be related. That's a kernel panic. Please go to a terminal and run this command...

sudo apt-get --reinstall install linux-backports-modules-intrepid

...and see if that fixes it.