OK, pip uninstall followed by pip install worked. I was assuming that -U --no-deps would sort out that problem for me but it didn't. cheers --cjc ________________________________ From: firedrake-bounces@imperial.ac.uk [firedrake-bounces@imperial.ac.uk] on behalf of Cotter, Colin J [colin.cotter@imperial.ac.uk] Sent: 13 July 2015 08:40 To: firedrake Subject: [firedrake] mpi problem Dear all, Not strictly a Firedrake problem but I hope you'll indulge me. I upgraded to 14.04 over the weekend, and now I get: In [2]: from mpi4py import * --------------------------------------------------------------------------- ImportError Traceback (most recent call last) <ipython-input-2-13eee3001ee9> in <module>() ----> 1 from mpi4py import * ImportError: libmpi.so.0: cannot open shared object file: No such file or directory This is true, there is indeed no libmpi.so.0 anywhere on the system. What should I do? cheers --cjc