Everyone else is away for a couple of days so I took the opportunity to upgrade our Mythbuntu installation from 0.26 to 0.27 last night. It turned out much simpler than I expected. We have a backend and several frontends, so I downloaded the latest Mythbuntu to reinstall the frontends (I wanted to convert one of them to use an SSD anyhow, so reinstallation was the easiest way to deal with it), but for the backend I wanted to upgrade the system in place.
After backing up the database all I needed to do was to add the 0.27 repository in /etc/apt/sources.d and then:
# apt-get update
# apt-get dist-upgradeand reboot. Everything came back very happily, the frontends talk to it without a problem, the web interface works and for the first time in a while I can connect from my desktop (which was reinstalled with Mint17 some time ago).
The only remaining problems I have are that the picture on one of the televisions is a little too wide which I think might be down to the nVidia driver on that frontend, and the frontends don’t shut down when requested which I’m sure I’ve fixed before, but for the moment I can’t recall how.