xclusive585 wrote:Well said Widget.
(Im curious however what debian packages or repos wouldn't work on a Ubuntu system?)
A big +1 to everything you said. I use Ubuntu server on my good headless rig here, but I always hated the breakages with Ubuntu desktop versions.
Linux Mint has proven to be an extremely solid OS, and yes part of that is by not having to commit every package update Ubuntu changes (and breaks). Mint has become my sole OS on my primary machine and I do everything from run games in WINE to do some 3d/CAD design. It runs solid and smooth. I am a very happy camper.
And somewhere in the middle, between Debian and Ubuntu, is exactly where I want to be.
Debian and derivatives are the best, and Mint kicks the crap outta Ubuntu.

If you check with Ubuntu they will not recommend ever using a Debian package on your Ubuntu install. This is good advice.
There are many Debian packages that will work.
However, if you check things out, many packages do not use the same directories for all their little parts using the Debian install script on an Ubuntu system. This is because Ubuntu has changed many of the directories that they use in their install script for the same packages.
An easy example, that will not break your system (usually), is Desktop Environments. Debian uses /usr/share/images for Gnome images. Ubuntu uses /usr/share/backgrounds.
If you use the Debian package you will get a solid blue background on your Ubuntu install. This happens occasionally in testing.
There are many Debian packages that if mixed into your Ubuntu install will break the system. This has never happened to me as I have never mixed the 2 on my own. Both Debian and Ubuntu will tell you this is likely to happen with any kind of mixing between the 2 distros.
Ppas that offer packages from Debian repos for Ubuntu are generally simply replacing the Debian install script with one that is compatable with the Ubuntu file system.
As the install script is part ot any .deb it is the problem. The rest of the .deb is fine for either system including any bugs that may be in it.
Bugs are another problem when mixing. Some bugs that Debian has not fixed will be ignored by Ubuntu and the package used anyway. They will modify another package to mitigate the effects of the bug. Add enough Debian packages to Ubuntu, even ones with no file system differences, and you will get a problem because they will be fighting amongst themselves where the Ubuntu packages won't.
This is of coarse true with Ubuntu packages in a Debian install. If Ubuntu has changed one to work with a buggy Debian package and the bug is fixed by Debian then you are going ot have problems there.
Don't mix the buggers.
Dell XPS 420 Core2 Quad Q 6600, audigy5.1, Radeon HD 6450 - currently 4 320Gb HDD, Debian Squeeze for secure use, Debian testing for daily use, Debian Sid for fun.