/usr/share/doc/libgles2-mesa-dbg/changelog.Debian.gz is in libgles2-mesa-dbg 8.0.4-0ubuntu0.6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgles2-mesa-dbg/../libgles2-mesa/changelog.Debian.gz