I don't know if you are seeing the same video I put as reference, 5'10" shows the reference of the apt-get purge with all the packages he says need to be uninstalled.
copying the link again
yes, the video follow that process. I would not expect that removing a plugin would mess up the upgrade, if anything it would make it easier as it is one less thing to upgrade. regardless, my upgrade failed, nginx seems not able to find php-fpm even…
I have tried to follow the steps in this video youtube.com/watch?v=GjObhlFoUEU&t=1636s
however my upgrade failed.
I removed docker-gui before upgrading, and followed the steps listed.
currently I have
dpkg -l openmediavault