Whats the difference between MATE, Gnome-Classic and Gnome Flashback
Mate is the fork and continuation of Gnome 2 when Gnome 2 died and became Gnome 3. In other words, Mate is what Gnome 2 would have become if it had carried on uninterrupted. Mate was originally based on GTK2, but has recently transitioned over to GTK3 in UM 16.10.
GNOME Flashback is a session for GNOME 3 which was initially called “GNOME Fallback”, and shipped as a stand-alone session in Debian and Ubuntu. It provides a similar user experience to the GNOME 2.x series sessions. It also uses GTK+ 3.
Just for a laugh, I installed Ubuntu gnome on a VM and then installed Gnome flashback to see what it was actually like.
Dreadful…diabolically awful beyond rational description…