I tried mate on rpi3 a year or more ago and kodi did not work.Is kodi supported rpi 3 ubuntu mate?
If you want Kodi on the pi try osmc
I have. Kodi works and shut down properly with debian pixel gui and it uses hardware video. I loaded mate to rpi 3 but no video at all. My error probably.I hadto use Firefox as it didn't like Cromium.