So, having played around with GitLab for a while, I figured it was time to upgrade....
So clicked around for a bit, tried with a server still not used by anyone for any projects, and completely screwed it up. But I did learn one very useful lesson there, when I'm doing an upgrade, follow the upgrade instructions and not those very tempting installation instructions, it truly makes a world of difference to your setup.
Once you've found the right document, with the starting point you're at, and the finish you're aiming for, follow the guide and you'll reach a goal, most likely the one you want.
What really bothers me, I have tried this enough times that, this should not be necessary for me to tell myself :-)