Some difficulty installing v4.7.0.b02 in Ubuntu Server 18.04 LTS AWS EC2 instance

[remkonoteboom]

If TACTIC (or rather the underlying CherryPy module) exits immediately, that means it cannot bind to that port. CherryPy is pretty sensitive to the domain name that is passed through. It may be the "http://" part after -s

Try:

python3 startup_dev.py -p 80 -s <DOMAIN_NAME>

withouth the "http://" on the domain name.