The generic binary did the trick, thanks! The PPA seems fine to me on my Ubuntu 15.10. Just got an update to Julia 0.4.5 today.
The problem might be that in the classroom the computers still have Ubuntu 12.10, or that libfftw is not installed. So I'm guessing that the generic library comes with libfftw built in "statically". Since I don't have root access at the classroom to update Ubuntu or install the libfftw, I'll stick with the generic binary for now. Thanks for the help. Regards.
