```
agung@agung-K43SJ:~$ steam
Running Steam on ubuntu 15.04 64-bit

STEAM_RUNTIME is enabled automatically

Installing breakpad exception handler for appid(steam)/version(0)

libGL error: unable to load driver: nouveau_dri.so

libGL error: driver pointer missing

libGL error: failed to load driver: nouveau

libGL error: unable to load driver: swrast_dri.so

libGL error: failed to load driver: swrast

```

Before that, I also tried installing Steam from Terminal, but it didn't launch after having downloaded the update.

Can anyone help me finding a solution to install Steam?