/usr/share/doc/libgail18/changelog.gz is in libgail18 2.24.10-0ubuntu6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgail18/../libgtk2.0-0/changelog.gz
/usr/share/doc/libgail18/../libgtk2.0-0/changelog.gz