I had problems getting Steam to run on Ubuntu 15.04, I would get this error.
[email protected]:~$ steam Running Steam on ubuntu 15.04 64-bit STEAM_RUNTIME is enabled automatically [2016-01-05 11:03:24] Startup - updater built Dec 14 2015 11:15:53 SteamUpdateUI: An X Error occurred X Error of failed request: BadValue (integer parameter out of range for operation)
I found this script that you run on your system as a normal user and it will set some variables and then run Steam successfully.
#!/bin/bash export LD_PRELOAD='/usr/$LIB/libstdc++.so.6' #Export so all child processes are affected as well export DISPLAY=:0 steam -tcp
That is how easy it is to get Steam running on Ubuntu 15.04.