Ubuntu image for the new Raspberry Pi 3 B+

Hi,

I just got a couple of Rpi 3 B+ and they work really great with the latest Rpi Image 2018-03-13-raspbian-stretch.img. However, I wanted to install ubuntu 16.04.2 or ubuntu-mate-16.04.2, but neither will boot. The red LED turns on and stays on, or in the case of ubuntu-mate it blinks slow 4 times, then fast 4 times, then the same cycle again. I tried these img files with the previous Rpi 3 B and they run fine.

Is there an ubuntu image I can find that will work with the new B+, or is it a known issue?

Please help.

I didn't find the right solution from the Internet.

References:

https://bit.ly/2JcgoJA

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Thanks