Steam Client doesn't work on Ubuntu 14.04

[Santiph]

Every time I try to run "steam" on the console, I get this:

Running Steam on ubuntu 14.04 64-bit
STEAM_RUNTIME is enabled automatically
[2014-05-20 01:47:04] Startup - updater built Apr 23 2014 13:46:58
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
[2014-05-20 01:47:04] Verifying installation...
[2014-05-20 01:47:04] Verification complete
Gtk-Message: Failed to load module "overlay-scrollbar"
Gtk-Message: Failed to load module "unity-gtk-module"
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig error: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 70: non-double matrix element
Fontconfig warning: "/etc/fonts/conf.d/10-scale-bitmap-fonts.conf", line 78: saw unknown, expected number
[0520/014704:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
Installing breakpad exception handler for appid(steam)/version(1398287272_client)
Generating new string page texture 12: 48x256, total string texture memory is 49,15 KB
Generating new string page texture 13: 256x256, total string texture memory is 311,30 KB
Generating new string page texture 14: 128x256, total string texture memory is 442,37 KB
Generating new string page texture 15: 384x256, total string texture memory is 835,58 KB

Any idea what could it be?

[JamieLinux]

install open source drivers install and run steam once running reinstall pritortary drivers.

[Santiph]

I'll try it