/usr/share/doc/kicad/changelog.Debian.gz is in kicad 4.0.7+dfsg1-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/kicad/../kicad-common/changelog.Debian.gz
/usr/share/doc/kicad/../kicad-common/changelog.Debian.gz