/usr/share/doc/pulseaudio-module-bluetooth-dbg/changelog.Debian.gz is in pulseaudio-module-bluetooth-dbg 1:4.0-0ubuntu11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/pulseaudio-module-bluetooth-dbg/../libpulse0/changelog.Debian.gz