1. img 파일 다운로드
https://ubuntu-mate.org/download/
https://ubuntu-mate.org/raspberry-pi/ubuntu-mate-16.04.2-desktop-armhf-raspberry-pi.img.xz
2.SD카드로 이미지 복사
sudo dd bs=4M if=이미지파일.img of=/dev/sdX status=progress conv=fsync
https://ubuntu-mate.org/download/
https://ubuntu-mate.org/raspberry-pi/ubuntu-mate-16.04.2-desktop-armhf-raspberry-pi.img.xz
sudo dd bs=4M if=이미지파일.img of=/dev/sdX status=progress conv=fsync