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The name you're looking for is MATE desktop. I've been using it for many years because I never liked Gnome 3 (constant churn, breaking plugins, themes etc). I'm using it on Debian but there's also Ubuntu MATE and Fedora & Opensuse spins

Although MATE does not technically use GTK2 now, but it is pretty good in sticking with the look and feel of a traditional customization desktop. I pretty much recommend Ubuntu MATE

Ubuntu MATE is excellent, but more people should check out Solus MATE if they would like to have rolling release - it's a very underrated distro.