Unable to install Docker via OMV-Extras

Not 100% sure if this should be posted here so apologies.

I've just performed a fresh install of OMV. I set the time zone, ran the update and installed anything that needed to be updated and rebooted afterwards just to be on the safe side.

Then I installed OMV-Extras.

When I try and install Docker I'm getting the following message:

I have ran the apt clean option from the OMV-Extras settings tab but it didn't fix it.

Also, if I try and check for updates now I'm getting this message:

Does anyone have any ideas on how to fix this?

Weird, I can ping teamviewer.com fine but I can't access teamviewer.com in my browser.

Is there any way of removing the need to check teamviewer as I don't and won't ever use it?

Okay thanks.

I'm not ofay with Linux that much, would not being able to access one URL break the whole update process though? I would have thought that it would just bypass it unless it was critical. I guess that would cause too many issues now that I think about it.