/usr/share/doc/libcmap4/changelog.Debian.gz is in libcmap4 2.3.5-3ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcmap4/../libcorosync-common4/changelog.Debian.gz
/usr/share/doc/libcmap4/../libcorosync-common4/changelog.Debian.gz