If you can login to the client then go access the setting windows then try changing the Download Region to other location at the Download + Cloud tab. Try several location if it still doesn't work.
Here are the latest client update note:
- Fixed texture corruption when using the Game Overlay in OpenGL games
- Fixed failing to do HTTP downloads from hosts that started with a numeral <--- Maybe this bug is the cause of your problem.
- Linux - Added X window manager name to system info dialog
I can't log in because Steam automatically tries to update before entering the client. But I think something may be wrong on their end. Their website is loading VERY slowly, and when I attempted to reinstall Steam I can't even download the 1.6mb file from their site. It times out.
Are you guys able to log in without incident? Perhaps they're getting flooded due to the Linux release?