/usr/lib/salome/lib/libDF.so.0 is in salome-kernel 6.5.0-7ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/salome/lib/libDF.so.0.0.0
/usr/lib/salome/lib/libDF.so.0.0.0