I'm new to ubuntu. Can you help me with this problem? I'll talk in comments what information you need from me.
I have typed in terminal steam
cristi@GIGABYTE-PC:~$ steam
Running Steam on ubuntu 16.04 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
I have ubuntu 16.04.
steam
then you can copy the output which gets generated there with (ctrl+shift+c) after you selected it with the mouse, edit your question and paste it into it.