/usr/share/doc/libegl-mesa0/changelog.Debian.gz is in libegl-mesa0 18.0.0~rc5-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libegl-mesa0/../libgbm1/changelog.Debian.gz
/usr/share/doc/libegl-mesa0/../libgbm1/changelog.Debian.gz