Copy/paste, unable to install

I dabbled with Ubuntu awhile back and have now returned to try again, but I find I've forgotten a lot and I'm now very frustrated. I just need a little help to get me going.

I'm on a fast W10 laptop and installed Ubuntu budgie in a virtualbox VM. Ubuntu is up and running but I have 2 frustrating things I need help with.

1. I can copy/paste within Ubuntu, but I cannot copy/paste from W10 to Ubuntu or reverse. How do I enable that? I need to do that to access some files on the Windows side.

2. I tried to install the kodi app within Ubuntu and failed.
If I used the graphic software interface it just would not install. Just stayed there no matter how long I waited after clicking on install.

If, in a terminal, I used
sudo apt install kodi
It also failed with:

E: could not get lock /var/lib/dkpg/lock-frontend - open (11: Resource temporarily unavailable)
E: Unable to acquire the dpkg frontend lock (/var/lib/dkpg/lock-frontend), is an other process using it?

As far as I know nothing else is running and I don't know what /var/lib/dkpg/lock-frontend is or how to unlock it.

It's very frustrating for a beginner. Can someone please help?

Thanks.