/usr/lib/x86_64-linux-gnu/libsefs.so.4 is in libsefs4 3.3.8-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsefs.so.4.0.4
/usr/lib/x86_64-linux-gnu/libsefs.so.4.0.4