ubuntu-apt-sources/steam.list

deb http://repo.steampowered.com/steam/ precise steam
# deb-src http://repo.steampowered.com/steam/ precise steam
Quantal current 2013-04-18 08:42:05 +01:00			`deb http://repo.steampowered.com/steam/ precise steam`
raring Current 2013-04-19 00:40:07 +01:00			`# deb-src http://repo.steampowered.com/steam/ precise steam`