Adding a custom menu to Fluxbox is very easy, this is how. The default ~/.fluxbox/fluxbox-menu file looks like this, it reads the /etc/X11/fluxbox/fluxbox-menu file to create the root menu for Fluxbox. [begin] (fluxbox)   [include] (/etc/X11/fluxbox/fluxbox-menu) [end][begin] (fluxbox) [include] (/etc/X11/fluxbox/fluxbox-menu) [end] But if you add a simple submenu to it like this, then you get …