CSGO won't open - Steam - Ubuntu 16.04

Solution to the problem:

AMD has a new driver. Use the Beta version to solve the problem, it’s maybe not as stable as the open source Ubuntu driver but CS:GO (and other games on steam) will be playable again!

https://support.amd.com/en-us/kb-articles/Pages/AMD-Radeon-GPU-PRO-Linux-Beta-Driver%E2%80%93Release-Notes.aspx

Supported GPUs, just install and enjoy your games again: ​

​AMD Radeon™ RX 480 // AMD Radeon™ R9 M395X // ​Radeon™ RX 470 // AMD Radeon™
R9 M385 // ​Radeon™ RX 460 // ​AMD Radeon™ R9 M380 // AMD Radeon™
R9 Fury X // AMD Radeon™ R9 M270X // AMD Radeon™ R9 Fury // AMD Radeon™ R9 360 // ​AMD Radeon™ R9 Nano // ​AMD Radeon™ R9 290X // ​AMD Radeon™ R9 390X // ​AMD Radeon™ R9 290 // AMD Radeon™ R9 390 // ​AMD Radeon™ R9 285 // AMD Radeon™ R9 380X // ​AMD Radeon™ R7 260X // ​​AMD Radeon™ R9 380 // ​AMD Radeon™ R7 260

Information direct from the official AMD site.

For all other / older GPUs from AMD please use the open-source driver "radeon"!

(Thanks to CelticWarrior for pointing out, that youve to use radeon than)