Kochmorse is a simple to use morse-code tutor using the so called Koch mehtod. It can not only
be used to learn the more-code but also to practice it using a random QSO simulator.
Enable snaps on Kubuntu and install Koch-Morse Tutor
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.