/usr/lib/x86_64-linux-gnu/libjbig.so is in libjbig-dev 2.0-2ubuntu4.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libjbig.so.0
/usr/lib/x86_64-linux-gnu/libjbig.so.0