I'l try keep this as quick as possible, it's just feedback from an admittedly slightly dim steam user, basically i tried Ubuntu due to the advert on Steam, apart from wanting the cute penguin for TF2 i also wanted to support Valve, but i had a frustrating experience.
Here's how it went,
Went to site, downloaded and used installer, failed to complete installation twice, burnt Ubuntu to DVD and tried again, installed Ubuntu, restarted computer and got a black screen, restarted again, Ubuntu now loads, went to get ATI graphic driver for linux, tried to install three times, became a non-responsive program half way through each time, tried to change screen resolution to 1024-768 but got huge amount of screen disturbance, went back to pre-set tiny writing, then tried to install Steam instead, wanted to install but instead of an install button there is only a buy option next to it even though it's free, reloaded it a few times, buy option disappears and install appears, i push it quick while the install option has decided to stay around, steam downloads, try to open Steam and get a small black screen saying steam needs to install additional programs, i close it and Steam loads anyway but it appears every time i open steam, downloaded TF2, got my penguin and exited Ubuntu, on reloading windows it had to do a disc check and parts of my AVG are missing so i'l do a re-install, i could go on with other programs that i tried to install and failed to but i'l leave it there.
Ok so no big deal, it's more than likely i'm just not clever enough to find out why i had all these problems, but the only reason i mention it is that if other Steam users are as inept as me then they're going to have a similar experience, it wasn't great, i do hope i am in a minority though because i'd like to see people using a different OS and helping Valve, but for now i'm back on Windows again.
(and i only had 2 games available to play on Linux out of my whole library)