[racket] Installing on Ubuntu, "command not found"

I just tried running the Ubuntu installation script (is that new?) and
while it seems to have put everything in the right places, I'm getting a
"command not found" error when I actually go to run it:

  church /home/dblaheta -1-> which racket
  /usr/local/bin/racket
  church /home/dblaheta -2-> racket
  racket: Command not found.
  church /home/dblaheta -3-> /usr/local/bin/racket
  /usr/local/bin/racket: Command not found.
  church /home/dblaheta -4-> /usr/local/racket-5.0.2/bin/racket
  /usr/local/racket-5.0.2/bin/racket: Command not found.
  church /home/dblaheta -10-> ls -l /usr/local/bin/racket
  lrwxrwxrwx 1 root root 34 2011-01-26 11:44 /usr/local/bin/racket -> /usr/local/racket-5.0.2/bin/racket
  church /home/dblaheta -11-> ls -l /usr/local/racket-5.0.2/bin/racket
  -rwxrwxr-x 1 root root 2530282 2010-11-06 20:36 /usr/local/racket-5.0.2/bin/racket

Everything appears to be chmodded correctly, and the /usr/local/bin
links are pointed to the correct place, and my PATH is fine.  (I also
saw this behaviour when installing to /usr/local/racket/, so that's not
it either.)  I am running Ubuntu 10.04.1 (Lucid), not Jaunty, but I
wouldn't have thought that would cause an incompatibility.  I'm actually
a bit stumped on where to look next---has anyone seen a problem like this?

-- 
-=-Don Blaheta-=-dblaheta at monm.edu-=-=-<http://www.monmsci.net/~dblaheta/>-=-
"Everyone in the sciences secretly believes that mathematicians are
smarter than they are. I think mathematicians also believe this."
							--Paul Graham