When we run:
1) http://install.sh [Enter]
2) http://install.sh /opt/my_path
- then two FB instances will be created w/o problem, and first instance will be placed in the default folder "/opt/tfirebird"
But this is not so if folder "/opt/firebird" does not exists before installation and we want to create only FB instance in "non-standard" path.
Error on console will be:
systemctl --quiet enable firebird-superserver.service
Failed to execute operation: No such file or directory
It seems that some part of code inside installer still searches "/opt/firebird" folder in this case.