For those viewing my question, another solution is to install the steam package from the website here.
Then if you get this error:
$ steam
Running Steam on ubuntu 15.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(0_client)
libGL error: unable to load driver: r600_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: r600
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
Then simply type in
cd $HOME/.steam/steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu
mv libstdc++.so.6 libstdc++.so.6.bak
cd $HOME/.steam/steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu
mv libstdc++.so.6 libstdc++.so.6.bak
And hit ENTER.
Now, in your terminal, it should look like this.
If it does look something like that, then you did it correctly. DO NOT CLOSE THE TERMINAL, LEAVE IT OPEN JUST LIKE THAT! And now you will need to type in 'steam' and hit ENTER again. At this point it should be opening your steam. STILL, DO NOT CLOSE THE TERMINAL! THIS WILL CLOSE STEAM! Wait for steam to finish its updating, and soon steam should ACTUALLY open!
If steam actually works and opens for you, then you did this all correctly! If it doesn't work, then you made a mistake, or this just does not work for you. After doing this, you will never need to follow these instructions again. Steam should now always just open up when you click on the icon.
cd $HOME/.steam/steam/ubuntu12_32/steam-runtime/i386/usr/lib/i386-linux-gnu mv libstdc++.so.6 libstdc++.so.6.bak cd $HOME/.steam/steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu mv libstdc++.so.6 libstdc++.so.6.bak
– yeah_oh_yeah Nov 27 '15 at 04:15