Bought a pro virtualmin license for 10 domains. Purchase gives wget command line with serial # and license info. Invoke this to download. Server is fresh base Ubuntu 14.04 install just like requirements ask for.
Installer fails. I see lines in console output during install like this that seem to be root cause:
W: Failed to fetch http://software.virtualmin.com/ubuntu/dists/virtualmin-trusty/main/binary-amd64/Packages 401 Unauthorized
W: Failed to fetch http://software.virtualmin.com/ubuntu/dists/virtualmin-trusty/main/binary-i386/Packages 401 Unauthorized
W: Failed to fetch http://software.virtualmin.com/ubuntu/dists/virtualmin-universal/main/binary-amd64/Packages 401 Unauthorized
W: Failed to fetch http://software.virtualmin.com/ubuntu/dists/virtualmin-universal/main/binary-i386/Packages 401 Unauthorized