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