I've been running Mythbuntu on rPi2 for some time. I bought a couple of rPi3s in an effort to improve performance a bit. However, when I put the SD card from my rPi2 into the rPi3 the boot just shows a colorful image.
Am I wrong in thinking rPi3 should be binary compatible with rPi2?
PS. this is not power related. I specifically bought the official 2.5A rPi3 power supply to be sure.