[racket] racket ubuntu ppa upgraded to 5.1.1

From: Jon Rafkind (rafkind at cs.utah.edu)
Date: Wed Jun 22 18:01:03 EDT 2011

The racket ppa for ubuntu has been upgraded to 5.1.1. This should work on
  lucid (10.04)
  maverick (10.10)
  natty (11.04)

although I only tested on lucid. Thanks to Todd O'Bryan for poking me.


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