github pi-gen-navio build failed on Ubuntu 16.04.
I intalled the prerequisite and the build stuck at Emlid stage 3 - intsalling ardupilot
./build-docker also failed:
W: Failed to fetch http://deb.debian.org/debian/dists/stretch/InRelease Temporary failure resolving ‘deb.debian.org’
W: Failed to fetch http://security.debian.org/debian-security/dists/stretch/updates/InRelease Temporary failure resolving ‘security.debian.org’
W: Failed to fetch http://deb.debian.org/debian/dists/stretch-updates/InRelease Temporary failure resolving ‘deb.debian.org’
W: Some index files failed to download. They have been ignored, or old ones used instead.