(On a fresh Ubuntu 7.04 (‘Stinky Badger’) box) 

rasputnik@hypnotoad $ svn version
The program 'svn' is currently not installed.
You can install it by typing:
sudo apt-get install subversion
bash: svn: command not found
rasputnik@hypnotoad $ which svn
rasputnik@hypnotoad $

Nice, in a scary sort of way.