Is it possible to make Ubuntu 20.04 look like an older looking Ubuntu like 4.10?
This looks like a support request.
This site is for the co-ordination of the Ubuntu project(s), and other non-support matters. For Ubuntu Support options, please have a look at https://community.ubuntu.com/t/finding-help/709
FYI: Ubuntu 4.10 (Warty Warthog) used GNOME2, which is closest to MATE, so the easiest way is using Ubuntu-MATE.