SSH issue and chown invalid group problem

[MamasLT]

Hello. Firstly the script asked me to enter an SSH key of my local workstation. I had no idea what to enter and where to get that SSH key. Would be nice to have more info on this.
I skipped this and SSH hardening options and continued.
Got stuck here (using updated Ubuntu 18.04):
"Now creating /opt/ejabberd/ directory...

Finished creating /opt/ejabberd/ directory.

Now setting permissions...

chown: invalid group: ‘root:aenigma’
root@xmpp:~#"

Clearly there is an issue of script chowning needed directories. Can't continue setup, not sure what to do here. Any help please?
Thanks

[nordurljosahvida]

Hi @MamasLT. Truly sorry for not getting back to you earlier. Everything should be more detailed and documented, but getting things to work is already really time consuming as you might expect. I'll work on a better description asap. Is your machine available for me to log in and take a look?