$ wget https://odroid.in/ubuntu_16.04lts/ubuntu-16.04.2-minimal-odroid-xu4-20170516.img.xz
$ wget https://odroid.in/ubuntu_16.04lts/ubuntu-16.04.2-minimal-odroid-xu4-20170516.img.xz.md5sum
$ md5sum -c ubuntu-16.04.2-minimal-odroid-xu4-20170516.img.xz.md5sum
ubuntu-16.04.2-minimal-odroid-xu4-20170516.img.xz: OK
$ unxz ubuntu-16.04.2-minimal-odroid-xu4-20170516.img.xz