Steam just stopped to work. It worked fine until a couple of days ago, but now it won't launch. I've tried both to restart the computer and reinstall Steam, but it makes no difference. When I tried to launch it from the console I get only this:

marc@marc-UX21E:~$ steam

Running Steam on ubuntu 13.04 32-bit

STEAM_RUNTIME is enabled automatically

Any idea about what may it be?

Thank you.

EDIT:
I have tried to launch it after a computer restart and got some kind of error after trying to update Steam:

Running Steam on ubuntu 13.04 32-bit

STEAM_RUNTIME is enabled automatically

Installing breakpad exception handler for appid(steam)/version(1378500910_client)

Installing breakpad exception handler for appid(steam)/version(1378500910_client)

Installing breakpad exception handler for appid(steam)/version(1378500910_client)

unlinked 0 orphaned pipes

Gtk-Message: Failed to load module "overlay-scrollbar"

Installing breakpad exception handler for appid(steam)/version(1378500910_client)

[0916/102432:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation