After upgrading to Debian 8.0 (jessie) Skype stopped working with the following error message:
skype: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory
There is a really simple fix available:
sudo ln -s /usr/lib/mesa-diverted/i386-linux-gnu/libGL.so.1 /usr/lib/i386-linux-gnu/
Done.