I just installed ubuntu 15.04,fresh install, i have installed steam from terminal "sudo apt-get install steam", no problem on the installation, but after star steam and download the data (210mb), does not start, launching it from terminal says:
Running Steam on ubuntu 15.04 64-bitSTEAM_RUNTIME is enabled automatically
[2015-04-26 20:04:03] Startup - updater built Apr 13 2015 15:17:10
SteamUpdateUI: An X Error occurred
X Error of failed request:  BadValue (integer parameter out of range for operation)
I do not know what to do, what data need so you can help me, I am not new using ubuntu, but I generally do not run into these problems, the previous version of ubuntu 14.10 ran smoothly steam.

Sorry if I write with mistakes, English is not my native language, but I thought this forum is where I have more chance of a solution, thx.