I had a look and this is what I have in /opt/slicer/Slicer-4.11.0-2020-06-30-linux-amd64/lib/Python/lib/python3.6/site-packages/
:
This is all the other files I could find:
$ pwd
/opt/slicer/Slicer-4.11.0-2020-06-30-linux-amd64
$ find . -iname fenics*
./lib/Python/lib/python3.6/site-packages/fenics_dijitso-2019.1.0.dist-info
./lib/Python/lib/python3.6/site-packages/fenics_ufl-2019.1.0.dist-info
./lib/Python/lib/python3.6/site-packages/fenics_fiat-2019.1.0.dist-info
./lib/Python/lib/python3.6/site-packages/fenics_ffc-2019.1.0.post0.dist-info
./lib/Python/lib/python3.6/site-packages/fenics-2019.1.0.dist-info
$ find . -iname dolfin*
./lib/Python/lib/python3.6/site-packages/ffc/backends/dolfin
This is where the system installed dolfin module is:
In [1]: import dolfin
In [2]: dolfin.__file__
Out[2]: '/usr/lib/python3/dist-packages/dolfin/__init__.py'
In [3]:
So the one in Slicer should have a similar name I guess but with a different path.