I'm running Kubuntu 14.04. I'm trying to use Handbrake to turn an MKV file into a playable DVD. Supposedly Handbrake can do this -- but the only output format it seems to provide is, again, MKV. I found a post suggesting that I disable the Ipod-friendly format, but I tried that and it made no difference. Am I missing something?
Handbrake converts videos into mp4 (H.264 etc), not into MPEG2 which is what you would need for "DVD" format. You would need to convert the mkv file into MPEG2 video and then create the VOB file structure for the DVD (this is called "authoring" a DVD).
Here is a guide from 10 years ago describing the process - I guess the software is all too old to be in the current Ubuntu repos though: https://www.linux.com/news/quick-guide-dvd-authoring