Until I upgraded to 20.04 I used Gnome-Manual-Duplex to print front to back on my HP laserjet.
However this package depends on python-gamin
and python-cups
which are no longer available in the repos.
How do I re-install Gnome-Manual-Duplex and its dependencies in Focal Fossa?
You still can download and install it by using dependencies from 19.10:
and use it as before.