Well this time I really have bumped my head hard on Ubuntu.
Video editing apps are simply a shambles. The default editor, PiTiVi (which apparently is Ubuntu-speak for “PiTiFul”) is terrible. Editing is a joke. It would take all morning to list my complaints, which isn’t worth my time. Just suffice to say, it sucks.
I installed a half-dozen competing editors and found that the only app that comes close to being usable is Kdenlive, which is still pretty hard to use.
This is all to be expected, and is why I kept my Windows machine for multimedia editing. But if you are planning a switch to Ubuntu, and expect to get any multimedia work done on it, watch out. The apps are very, very weak at this time.