Today I updated my Plex Media Server, but it wouldn't restart! I didn't see any errors on the command-line or in any of the logs. It was silently failing with no hints to the problem.
I looked at the init script and tracked down how to manually attempt to start Plex. When starting it manually, I found it was giving an error of:
error while loading shared libraries: libboost_system.so.1.50.0