Remastered based on the original wav files, since my previous version was based on the lossy, compressed ogg files.
Adjusted a couple of levels, having actually tested it on as many different 5.1 and 2-channel stereo environments I could find.
Updated the ubuntu-sounds package and pushed to bzr and a PPA for easier installation on lucid, maverick, natty, or oneiric!
Install 5.1 channel Ubuntu login sound using PPA
Open the terminal and run the following commands
sudo apt-add-repository ppa:kirkland/sound
sudo apt-get update
sudo apt-get install ubuntu-sounds
After installation you have to Log out, and then log back in.