When it happens, try pressing alt-enter to go into windowed mode, if this doesn't work and it seems like the computer has locked, check the ip of your computer ( /sbin/ifconfig ), and if you have another computer available (or if your friend has a laptop he can bring over), try to ping the ip and see if it responds, if it does you can ssh in to the computer to investigate.
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Eagles may soar, but weasels don't get sucked into jet engines...
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