You can get Ubuntu MATE to work on a 3B+ using the method I describe in “How-To Set Up and Upgrade Ubuntu MATE 16.04 on a Pi 2/3/3B+” 
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You can get Ubuntu MATE to work on a 3B+ using the method I describe in “How-To Set Up and Upgrade Ubuntu MATE 16.04 on a Pi 2/3/3B+”