We're running a Ubuntu Server VM with OpenCPU (that's an API for R). Unfortunately we're unable to get the Cairo R package to play, the error message (from within R) is as follows:

unable to load shared object '/usr/lib/R/library/grDevices/libs//cairo.so': /usr/local/lib/libgmodule-2.0.so.0: undefined symbol: g_rec_mutex_lock 2: In png() : failed to load cairo DLL

We've tried purging and reinstalling cairo and libcairo and we both tried building the Cairo R package from source as well as using a precompiled version from Michael Rutter's ppas (all seems to work without errors).

Unfortunately none of us are real Ubuntu natives and thus we probably did some pretty amateur debugging. Any push in the right direction would be very appreciated. For example, we couldn't figure out how to reinstall whatever libgmodule refers to.