Pi3B+ was released in March 2018!
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Disregard my post. i didn’t realize there was a new pi out and was referring to the pi i just received with the wrong name.
Feel free to check out the method I describe in “How-To Set Up and Upgrade Ubuntu MATE 16.04 on a Pi 2/3/3B+”. It will get you up and running 16.04 or 18.04 on a 3B+ 
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issue solved
Update kernel to version 4.14.37 and injoy :
use from this Link: https://www.raspberrypi.org/documentation/linux/kernel/updating.md
Mohsen