Steam on Xubuntu
 

Running Steam on ubuntu 16.04 64-bit
STEAM_RUNTIME is enabled automatically
/bin/bash: /home/robin/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/lib/x86_64-linux-gnu/libtinfo.so.5: no version information available (required by /bin/bash)
awk: /home/robin/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/lib/x86_64-linux-gnu/libtinfo.so.5: no version information available (required by /lib/x86_64-linux-gnu/libreadline.so.6)
Installing breakpad exception handler for appid(steam)/version(1482202190)
libGL error: No matching fbConfigs or visuals found
libGL error: failed to load driver: swrast

Hello and welcome to the forums.

I have had that quite some time.
It looks like Steam uses old libs for Ubuntu still. Please try the following:

You might wanna make a backup of the files just in case before deleting them.