I have just installed Steam on Xubuntu, and after it finished installing it went to the login screen, but the screen is frozen, and I cannot press the buttons. When running Steam though the terminal it says:

alex@Craptop:~$ steam
Running Steam on ubuntu 14.04 32-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
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(1400690891_client)
[0522/174755:WARNING:proxy_service.cc(958)] PAC support disabled because there is no system implementation
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
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
[HTTP Remote Control] HTTP server listening on port 35849.
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
Installing breakpad exception handler for appid(steam)/version(1400690891_client)
Process 2764 created /alex-ValveIPCSharedObjects5
Installing breakpad exception handler for appid(steam)/version(1400690891_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

and then the terminal gets stuck too, letting me type into it but not doing anything. I tried reinstalling and restarting the computer, but it still keeps happening.