This is a quick look at Ubuntu 14.04 running on a Raspberry Pi 2. I was able to install MythTV backend on this but I can’t say how well it would work for daily use.
Ubuntu 14.04 image for Raspberry Pi 2:https://wiki.ubuntu.com/ARM/RaspberryPi
Installing Ubuntu 14.04 LTS on the Raspberry Pi 2:https://youtu.be/UGSQ7nzVCs4
Performance Overview of optimized build (SanDisk Extreme Pro microSD + Over-clocked):https://youtu.be/Og0yEautGWs
Intel NUC MythTV/Kodi PVR with HDHomeRun Extend Tuner:https://youtu.be/tJGyyo-zrG8
Raspberry Pi Playlist: https://www.youtube.com/playlist?list=PLErU2HjQZ_ZPvIdR5BEqDgO7DsGAla_AZ
Raspberry Pi (Amazon Affiliate)
US: https://amzn.to/2LpyVob
UK: https://amzn.to/2Z2inKX
CA: https://amzn.to/2y5yAUA
ES: https://amzn.to/3fSDhSS
FR: https://amzn.to/2LpurxT
IT: https://amzn.to/2T2VZNu
DE: https://amzn.to/3buHRmQ
IN: https://amzn.to/2B3PGTN
SiliconDust HDTC-2US-M HDHomeRun EXTEND (Amazon Affiliate)
US: https://amzn.to/3dV87bx
UK: https://amzn.to/2NYARVG
CA: https://amzn.to/38G96uZ
AU: https://amzn.to/2ABKdUm