Q:

Steam error: ''You are missing the following 32-bit libraries, and Steam may not run: libGL.so.1''

Yeah like i said in the title it brings up the terminal that is installing the plugin then it fails to download them. Then it closes. Next it brings up

You are missing the following 32-bit libraries, and Steam may not run:
  libGL.so.1

Finally I close that and steam box opens up and says

Steam-fatal error'' Fatal error:failed to load Steamui.so''.

That's basically my problem.

A:

For me this was solved by:

Creating /etc/ld.so.conf.d/steam.conf with the contents:
/usr/lib32
/usr/lib/i386-linux-gnu/mesa

Running sudo ldconfig to update the shared library cache
installing/reinstalling the 32bit mesa libraries: 
sudo apt-get install --reinstall libgl1-mesa-glx:i386

Source

