Finally my 3rd NC-server got offered 19->20 upgrade, so I attempted it as usuall. All apps had updates too, so I started web-updater. To my surprise, it ended with not_much_saying message “error detected” and when I returned to front-page, all I see is “503 Service unavailable”. Web-server is definitely running, but NC apparently not.
What should I do now? I do not know what got screwed during update (there was no other message). How is it possible at all, that stable-to-stable upgrade (after NC20x has been released so long time ago) ends with hard-bricked NC-server? I believe backup of some sort has been created during web-updater running, but I do not know how to restore it without web-interface…
Not so funny thing is, two other NC-servers I take care of got updated to 20.x a few weeks ago without any problem…