I simply hate gnome 3, how inflexible it is, how slow it got and I was wondering that can you replace gnome 3 with gnome 2 in newer distro's (say for example Ubuntu 20.04.1 LTS)?
Are there any security risks/flaws in older Desktop environments?
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GNOME2 used GTK2.
Most of GTK2 is EOL, the only parts of it still maintained are the parts used by
gimp which hasn't completed it's port to GTK3.
Lubuntu used LXDE which used GTK2, however Lubuntu switched to Qt5 & LXQt with Lubuntu 18.10
Ubuntu-MATE & the MATE desktop switched to GTK3 so long ago I can't recall which release (15.10 maybe, if not 16.04)
Xubuntu uses XFCE, which had fully ported to GTK3 by Xubuntu 19.10.
GTK2 is dead, or probably more accurately on life-support, so GNOME2 is not possible, or at least not advisable (security-wise, with very large portions of it abandon-ware)