Public bug reported:
On Ubuntu 18.10 (cosmic): Simply importing dolfin à la
```
python3 -c "import dolfin"
```
gives
```
ERROR: could not import mpi4py!
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3/dist-packages/dolfin/__init__.py", line 140, in
<module>
from .fem.assembling import (assemble, assemble_system, assemble_multimesh,
File "/usr/lib/python3/dist-packages/dolfin/fem/assembling.py", line 34, in
<module>
from dolfin.fem.form import Form
File "/usr/lib/python3/dist-packages/dolfin/fem/form.py", line 12, in <module>
from dolfin.jit.jit import dolfin_pc, ffc_jit
File "/usr/lib/python3/dist-packages/dolfin/jit/jit.py", line 121, in <module>
def compile_class(cpp_data, mpi_comm=MPI.comm_world):
RuntimeError: Error when importing mpi4py
```
Importing mpi4py works well:
```
python3 -c "import mpi4py"
```
** Affects: dolfin (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1792720
Title:
RuntimeError: Error when importing mpi4py
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