Using mate-terminal instead of gnome-terminal runs as expected with the
PageUp/Page Down Key.
--
Fedora release 26 (Twenty Six)
Kernel-4.12.8-300.fc26.x86_64
Joachim Backes <joachim.backes(a)rhrk.uni-kl.de>
https://www-user.rhrk.uni-kl.de/~backes/