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If you're running MATE, install mint-meta-debian-mate after the upgrade:
apt install mint-meta-debian-mate
If you're running Cinnamon, install mint-meta-debian-cinnamon after the upgrade:
apt install mint-meta-debian-cinnamon
However, since I downloaded the ISO named Mate/Cinnamon, I'm not sure how to tell which, if any, packages I should install.