Ubuntu server display

Good day all,
Received my Rock Pi yesterday and have installed Ubuntu server. It boots with no problem…The only problem I have is that it only displays in the top left quarter of my monitor…

Is there any way of getting full-screen display?

I’ve also flashed the Ubuntu 18.04.1 LTS version –
Boots fine however I’m prompted for a localhost login:

what is the username pasword?

default username: rock
default password: rock

thanks.

hope you have a great day …