Comment 15 for bug 701544

Still not working:
  Ubuntu 11.10 x86_64 Linux

Here's what I had to do: (same as above just don't run apt-get install - didn't work for me)

sudo apt-get remove phpunit
sudo apt-get upgrade pear
sudo pear channel-discover pear.phpunit.de
sudo pear channel-discover pear.symfony-project.com
sudo pear channel-discover components.ez.no
sudo pear update-channels
sudo pear upgrade-all
sudo pear install --alldeps phpunit/PHPUnit

then test with:

phpunit --version

if you get the Sebastian Bergmann everything should work fine from there.

followed this guys stuff
http://www.giocc.com/installing-phpunit-on-ubuntu-11-04-natty-narwhal.html