John,
I've just been playing around with VideoPad Editor from NCH software. From what I can see, it's free for home use. It's also relatively easy to use.
If you have a look at any of the songs in my signature, these were assembled using Open Shot Video Editor in Ubuntu. (I know you use Ubuntu and Open Shot is opensource freeware and a multitrack video editor).
I'm just passing this information along in case it's useful.
Regards,
Noel