If 32-bit and Wine games don't start on your nVidia Optimus computer, or you are encountering a "Failed to load libGL: libGL.so.1" error, there may be an issue with your 32-bit libraries, or they could simply be missing.
Make sure to install these 32-bit libraries, and reinstall bumblebee, bumblebee-nvidia and primus with the following commands:
sudo apt-get install libgl1:i386 libgl1-mesa-dri:i386 libtxc-dxtn0:i386
sudo apt-get install --reinstall bumblebee bumblebee-nvidia primus
For more information, take a look at the support articles about required 32-bit libraries as well as nVidia Optimus support.