Nextcloud on libreelec fails with php-version error message

[fymwpm]

Dear all,

i was running the nextcloud docker image on raspberri 3 with libreelec 10.0.4 (media server OS).
Some days ago the user interface was showing:

This version of Nextcloud is not compatible with > PHP 8.0.
You are currently running 8.1.16.

A research lead me to believe, that I have to update to the most recent ncp-docker image.

I then tried to follow the this documentation to update from docker to ncp:

NCP Docker - Updating NC & NCP

Due to the fact that Docker works different to a native installation of NCP (eg. on Debian using the Curl script), there are some features and and function that are not available or different for your NCP Docker container. Updates is one of them. A key difference with the Docker image is that the “NCP System” (or “NCP App” - NextCloudPi v1.51) updates require pulling the new docker image while Nextcloud Version Updates (e.g. NC 24.X.X to NC 25.X.X are preformed with the built in updater from Ne…

After stopping and removing current image, and pulling the latest one I started the new image.
I was then able to connect to the activation page with https://.

After activation and reboot I am seing the same php error message again.

Any help, to get this resolved would be highly appreciated.

Thanks and best regards,
Diemo

[fymwpm]

First of all:
Thanks to the team, who is maintaining and supporting nextcloud!

For others, who may run into the same problem, this is how I resolved it:

Preparation:

• Backup user directories
• Backup client directories
  (as files may have changed while server was offline, I am more interested in client versions than server versions)
• Export calendar from mobile device to ical using calendar import export app from f-droid

Installation:

• Downloading and installing new libreelec image
• Installing docker-addon from libreelec repository
• Downloading and installing nextcloud NCP-docker according to documentation (see above)
• Recreating users and shared calendar as administrator from web interface
• import calendar ical backup
• Configuring SMTP server for email communication
• If needed, deleting and re-creating accounts on client devices (despite using same IP and server DNS-Name, extisting client accounts mostly did not work)
• Enabling synchronization (attention: first sync may delete client files)
• Recover client backup and sync to server

Pitfall:
I was not aware, that the nextcloud PI panel is having a separate password for ncp user. When first getting directed to the panel, make sure to set the password under security/ncp-password.