Failing to load libGL.so.1 after installing bumblebee
Solution 1:
Okay, I found the fix, someone else posted it on askubuntu:
https://askubuntu.com/questions/125040/after-installation-of-bumblebee-i386-opengl-apps-stopped-working
If you haven't yet installed bumblebee, simply install libgl1-mesa-glx:i386 before you install bumblebee and you should be fine.
If you have already installed bumblebee, install libgl1-mesa-glx:i386 and then reinstall bumblebee-nvidia. It worked for me! (I used sudo apt-get --purge autoremove bumblebee-nvidia, then just reinstalled it.)