Install mwm by entering the following commands in the terminal:
sudo apt update sudo apt install mwm
Description:
Motif Window Manager
Motif is the industry standard GUI component toolkit for *NIX. . This package contains the Motif Window Manager, which has a clear but classical appearance. It is accompanied by xmbind, which is used to configure virtual key/mouse-bindings for Motif.
Homepage: http://motif.ics.com/
Version: 2.3.8-2build1
Section: universe/x11