There were no errors; it is true I omitted to run script, but I watched the console and there were no warnings or errors.

I re-ran the install script, using the previous config file, since it looks correct. The script did not install anything new, but did update sogo and sogo-activesync. It then said < SKIP > for all remaining steps. 

Where should I look for log files that will explain the RoundCube database error and the iredadmin 502 bad gateway? Or should I simply alter passwords or permissions directly in MySQL?

TIA

I cannot see the point in repeating exactly what I have done. Computers are deterministic, and it will produce the identical result if I repeat the same procedure.

Thank you for trying.  I was impressed by the concept and the efficiency of the installer, but it is apparently not in a condition to succeed -- at least on a fresh Debian 9 server.  I will consider trying a different distro, although I prefer to run Debian on servers, as I find it easiest to administer.

I saw that you have a new platform that is paid for.  This is not a commercial server, so I am minimizing expense.  I usually give donations to developers of software once it proves itself useful, but prefer to keep the costs on charity work low.

Thanks for the rapid reply!

This really shows up an important omission in your script, or in the installation instructions. If the script does not log itself, you should instruct users to run ' # script -t 2>~/install-iredmail.time -a ~/install-iredmail.script' or something similar...

For unconnected reasons, I am looking at possibility of running a further vm.  If I do, I will have a fresh server to try again.  Given the amount of time wasted on reinstating everything else after reimaging, installing and testing iredmail, I am not keen to simply do it over again.