It looks like you only shared the Verbose log which isn’t showing us much.
For Ubuntu, have you tried adjusting your Router Mode? Does it work in Localhost but not in Site Domains for example?
Preferences>Advanced>Router Mode>Localhost
Also if it’s only working in 7.1 but not 7.2 or 8.0 then it might be related to what we saw on the thread below which might provide more insight and debugging info: