How do I configure the grub screen?

I installed Ubuntu Mate 15 beta 2. It installed perfectly. However the grub boot screen is low res and I would like to change the picture. I used to be able to do this in Grub Configurator. I added the ppa but it still wont install.
How can I add the Grub Configurator package?

Thanks!
Len

Hi,

take a look here, it might help:

https://help.ubuntu.com/community/Grub2/Displays