Many thanks @balbes150
ubuntu_xenial_3.14.29_mate_20170302.img with Beelink GT1 s912 2GB/32GB ethernet works, wifi works, BT works after apt-get upgrade!
ubuntu_xenial_3.14.29_mate_20170302.img with Beelink Mini MXIII II s905x 2GB/8GB ethernet works, wifi works and BT works.