Clicking on the “Continue Update button” just brings up the “Go back to your Nextcloud instance to finish the update” button. Clicking on that then just takes me back to my Nextcloud desktop screen without the update being applied.
It feels like there is a flag incorrectly set somewhere indicating the install has been downloaded and completed successfully. I am certainly no expert through and this is a guess.
I am also using Unraid with the NC docker from linuxserver but I am running it on a DIY home server. I don’t have much experience with command line and terminal promts but I’ll give your process a go when I’m back from work.
I’ve had several issues since a failed update to version 20. I had to do a roll back to 19.0.2 and it hasn’t been completely happy since.
Fingers crossed the terminal upgrade process works.