Missing libmpi.so.0, dolfin 1.1, ubuntu 12.04

I just installed fenics 1.1 with all dependencies from the PPA with regular 'sudo apt-get install fenics'

I now get the following error when importing dolfin in python.

$ python -c"import dolfin"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/dolfin/__init__.py", line 16, in <module>
    import cpp
  File "/usr/lib/python2.7/dist-packages/dolfin/cpp/__init__.py", line 40, in <module>
    exec("import %s" % module_name)
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/dolfin/cpp/common.py", line 30, in <module>
    _common = swig_import_helper()
  File "/usr/lib/python2.7/dist-packages/dolfin/cpp/common.py", line 26, in swig_import_helper
    _mod = imp.load_module('_common', fp, pathname, description)
ImportError: libmpi.so.0: cannot open shared object file: No such file or directory

libmpi.so.0 doesn't appear anywhere on my system. According to 'locate' I have

$ locate libmpi
...
/usr/lib/libmpi_cxx.so
/usr/lib/libmpi_f77.so
/usr/lib/libmpi_f90.so
/usr/lib/openmpi/lib/libmpi.a
/usr/lib/openmpi/lib/libmpi.la
/usr/lib/openmpi/lib/libmpi.so
/usr/lib/openmpi/lib/libmpi_cxx.a
/usr/lib/openmpi/lib/libmpi_cxx.la
/usr/lib/openmpi/lib/libmpi_cxx.so
/usr/lib/openmpi/lib/libmpi_f77.a
/usr/lib/openmpi/lib/libmpi_f77.la
/usr/lib/openmpi/lib/libmpi_f77.so
/usr/lib/openmpi/lib/libmpi_f90.a
/usr/lib/openmpi/lib/libmpi_f90.la
/usr/lib/openmpi/lib/libmpi_f90.so
...