Steam Support
Steam Client Troubleshooting on Linux
What should I do if Steam is crashing, not opening correctly or closing immediately after launching?

Important:

Currently, Steam for Linux is only supported on the most recent version of Ubuntu LTS with the Unity, Gnome, or KDE desktops.

Troubleshooting


Check Video Drivers
You will want to install a 32-bit OpenGL program and make sure it runs properly, as most issues with Steam starting up on Linux are due to problems with the installation OpenGL drivers, or the lack of drivers entirely.

On Ubuntu, the easiest way to verify this is by installing mesa-utils:i386 and running glxinfo from a console.

Check the Wiki
The Valve Wiki hosted by Ubuntu has some common solutions and recommendations for installing and troubleshooting the Steam client. Valve Ubuntu Wiki

Still Not Working?
Crashes or bugs can be reported to our GitHub. Those reports are then used by our developers to help determine what needs to be fixed. Valve GitHub

Need help with Steam?
Use the Steam help wizard to narrow down your topic and get the help you need.
Help Me With My Issue
Community Help
Post or search in Steam Discussions for an answer to your question.
Visit Steam Discussions