Ubuntu MATE 15.04 for Raspberry Pi 2

Hi,
I have a problem. I pluged rpi2 to a TV (with HDMI) and I instaled berryboot with Ubuntu Mate 15.04, OpenElec 5.08 and Raspbian Jessie. All works fine, but Ubuntu Mate has activated overscan and I need fix the oversan. I see the config.txt file, but the file is empty. How I fix this?
Thanks for answers, Dynlik.
// Sorry, but my english isn’t very good :smiley: .

I had some problems in getting a RTC chip synchronised with the exact date and time during boot up, and have described this problem in a separate post.

I came up with a solution and have described it in my post in the Raspberry Pi forum, and hope these learnings can be takin into consideration in the next update or refresh of the UbuntuMATE Linux OS for Raspberry Pi 2 :wink: