Virtualmin Pro will not install on Ubuntu 16.04

Terminates with error "Fatal Error Occurred" messages about no release file for xenial and 401 unauthorized

Even though I can log in manually to software.virtualmin.com using my serial number and key

Status: 
Closed (fixed)

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Title: Will not install » Virtualmin Pro will not install on Ubuntu 16.04
Status: Active » Closed (fixed)