/usr/share/doc/libecpg6/changelog.Debian.gz is in libecpg6 9.1.23-0ubuntu0.12.04.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libecpg6/../libpgtypes3/changelog.Debian.gz
/usr/share/doc/libecpg6/../libpgtypes3/changelog.Debian.gz