/usr/share/doc/libegl1-mesa-dbg/changelog.Debian.gz is in libegl1-mesa-dbg 10.1.0-4ubuntu5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libegl1-mesa-dbg/../libgl1-mesa-dri/changelog.Debian.gz