/usr/lib/x86_64-linux-gnu/libMems-1.6.so.1 is in libmems-1.6-1v5 1.6.0+4725-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libMems-1.6.so.1.0.0
/usr/lib/x86_64-linux-gnu/libMems-1.6.so.1.0.0