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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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+