/usr/lib/x86_64-linux-gnu/libjpeg.so is in libjpeg-turbo8-dev 1.1.90+svn733-0ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libjpeg.so.8.0.2
/usr/lib/x86_64-linux-gnu/libjpeg.so.8.0.2