/usr/share/doc/libcommoncpp2-dev/changelog.Debian.gz is in libcommoncpp2-dev 1.8.1-6.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcommoncpp2-dev/../libccgnu2-1.8-0v5/changelog.Debian.gz