Connect the OMV system from the terminal SSH
1:
cd /etc/apt/sources.list.d
2:
/etc/apt/sources.list.d# ls
You can see the docker.list file
3:
/etc/apt/sources.list.d# rm docker.list
Delete this file
4:
Return to OMV system refresh and update
Or directly at the terminal
/etc/apt/sources.list.d# apt-get update && apt-get upgrade
Familiar updates are back