Cannot update plug-ins anymore with OMV 4.x.x

I noticed a few days ago that a "apt update" command is throwing some errors:

Err:21 https://dl.bintray.com/openmed…plugin-developers/arrakis stretch Release

403 Forbidden

Err:22 https://dl.bintray.com/openmed…evelopers/arrakis-testing stretch Release

403 Forbidden

Err:23 https://dl.bintray.com/openmed…n-developers/arrakis-plex stretch Release

403 Forbidden

Hit:24 http://ftp.ro.debian.org/debian stretch Release

Err:25 https://dl.bintray.com/openmed…n-developers/arrakis-sync stretch Release

403 Forbidden

Reading package lists... Done

E: The repository 'https://dl.bintray.com/openmediavault-plugin-developers/arrakis stretch Release' does no longer have a Release file.

I am running OMV 4.1.16. Has something changed on the plug-ins side for OMV 4? Won't we be able to at least do a "apt update" without errors? I tried looking for a similar issue here, but I did not find any. I did not mess with the apt configs.

I did not know that. I made the changes to sources.list.d as suggested HERE and my installation is now using the new Github repo. Basically you need to update apt list for the omv-extras repo to the Github one. I was not aware of this move. Thank you for replying, I will mark this thread as solved.

Will do that sometime. It is a pain in the you-know-what to upgrade. I don't have the time to redo all my configs and reinstall everything I need.

Later edit: It is actually quite easy to upgrade from OMV 4 to OMV 5. I used THIS POST and everything went extremely well. I only use some services and plugins, no ZFS, RAID or docker. It should not matter that much if a service like docker is used. I am pretty please the update did not break anything in my case.