/usr/share/doc/libavresample-ffmpeg2/changelog.Debian.gz is in libavresample-ffmpeg2 7:2.8.6-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libavresample-ffmpeg2/../libavutil-ffmpeg54/changelog.Debian.gz