/usr/lib/python2.7/dist-packages/sage/sat/ is in sagemath-common 8.1-7ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/sage/sat/__init__.py
/usr/lib/python2.7/dist-packages/sage/sat/all.py
/usr/lib/python2.7/dist-packages/sage/sat/boolean_polynomials.py
/usr/lib/python2.7/dist-packages/sage/sat/converters/
/usr/lib/python2.7/dist-packages/sage/sat/converters/__init__.py
/usr/lib/python2.7/dist-packages/sage/sat/converters/anf2cnf.py
/usr/lib/python2.7/dist-packages/sage/sat/converters/polybori.py
/usr/lib/python2.7/dist-packages/sage/sat/solvers/
/usr/lib/python2.7/dist-packages/sage/sat/solvers/__init__.py
/usr/lib/python2.7/dist-packages/sage/sat/solvers/cryptominisat.py
/usr/lib/python2.7/dist-packages/sage/sat/solvers/dimacs.py
/usr/lib/python2.7/dist-packages/sage/sat/solvers/sat_lp.py
/usr/lib/python2.7/dist-packages/sage/sat/solvers/satsolver.pxd