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You need to read the documentation in 2018.2 as there is much more going on and it seems to vary among all of us who've tried to upgrade. This can be of some help: Upgrade from Tableau Server 2018.1 or earlier to Tableau Server with TSM
I recommend you read the threads about this upgrade here in the forum. I also recommend you wait to install until 2018.2.1 because the current version is unstable for many.