/usr/share/doc/python-pyqt5.qtwebchannel/changelog.Debian.gz is in python-pyqt5.qtwebchannel 5.10.1+dfsg-1ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python-pyqt5.qtwebchannel/../python-pyqt5/changelog.Debian.gz