[racket] DrRacket/Ubuntu 12.04 LTS

New to modern Linux, screwing up Racket for far too long...

DrRacket is hanging repeatedly for me under Ubuntu... the screen will
darken and the program will become unresponsive. It eventually dies, Ubuntu
tries to report the problem, and fails.

FWIW, Firefox often exhibits similar behaviour when I'm on GMail trying to
tell you of my troubles, but Ubuntu's reporting tools seem to work better.

Hints?

TIA, Pat

PS Life under Ubuntu is still far better than life under Windows, but I
suspect my root problem is a very crash prone Acer laptop.
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