/usr/share/doc/libcmap-dev/changelog.Debian.gz is in libcmap-dev 2.3.3-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcmap-dev/../libcorosync-common4/changelog.Debian.gz
/usr/share/doc/libcmap-dev/../libcorosync-common4/changelog.Debian.gz