I need to remove appmenu as it has caused me to lose the menus for many programs.
And it is making it harder to use programs like Gimp, etc.
Can someone help me?
appmenu removes the menu from applications and adds it the panel via a plugin. If you don't have the panel plugin added to the panel, you'll need to remove this module. Removing it will depend on how you installed it. For more information, see: https://github.com/rilian-la-te/vala-panel-appmenu
Are you talking about the global menu if so it can probably be removed with apt
What do you mean by global menu?
sudo apt remove appmenu
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package appmenu
And also tried this.
sudo apt-get remove --auto-remove appmenu-gtk
Reading package lists... Done
Building dependency tree
Reading state information... Done
Virtual packages like 'appmenu-gtk' can't be removed
The menu on the panel that takes the menus from the application like in a Mac or Unity setup
Also something I use at times is "apt search" then some of the words in the item name or description to find the specific item
Ok, I will try it out.
Lots of finds?
apt search appmenu
Sorting... Done
Full Text Search... Done
appmenu-gtk-module-common/bionic,bionic,now 0.6.94-1 all [installed,automatic]
Common files for GtkMenuShell D-Bus exporter
appmenu-gtk2-module/bionic,now 0.6.94-1 amd64 [installed,automatic]
GtkMenuShell D-Bus exporter (GTK+2.0)
appmenu-gtk3-module/bionic,now 0.6.94-1 amd64 [installed,automatic]
GtkMenuShell D-Bus exporter (GTK+3.0)
appmenu-qt/bionic 0.2.7+14.04.20140305-0ubuntu2 amd64
application menu for Qt
budgie-appmenu-applet/bionic 0.6.94+repack1-1 amd64
Application Menu plugin for budgie-panel
gnome-shell-extension-multi-monitors/bionic,bionic 0.00~git20171014.1.df5d6e4-1 all
Better support for additional monitors in GNOME shell
indicator-applet-appmenu/bionic 12.10.2+17.10.20170425-0ubuntu1 amd64
Clone of the GNOME panel indicator applet
indicator-appmenu/bionic 15.02.0+16.10.20160927-0ubuntu3 amd64
Indicator for application menus.
indicator-appmenu-tools/bionic 15.02.0+16.10.20160927-0ubuntu3 amd64
Tools for debuging application menus.
libappmenu-gtk-parser-dev-common/bionic,bionic 0.6.94-1 all
Common header files for GtkMenuShell to GMenuModel parser
libappmenu-gtk2-parser-dev/bionic 0.6.94-1 amd64
GtkMenuShell to GMenuModel parser (GTK+2.0 development files)
libappmenu-gtk2-parser0/bionic,now 0.6.94-1 amd64 [installed,automatic]
GtkMenuShell to GMenuModel parser (GTK+2.0)
libappmenu-gtk3-parser-dev/bionic 0.6.94-1 amd64
GtkMenuShell to GMenuModel parser (GTK+3.0 development files)
libappmenu-gtk3-parser0/bionic,now 0.6.94-1 amd64 [installed,automatic]
GtkMenuShell to GMenuModel parser (GTK+3.0)
mate-applet-appmenu/bionic,now 0.6.94+repack1-1 amd64 [installed,automatic]
Application Menu plugin for mate-panel
mate-hud/bionic,bionic,now 18.04.8-0ubuntu1 all [installed,automatic]
Run menubar commands, much like the Unity 7 HUD
vala-panel-appmenu/bionic 0.6.94+repack1-1 amd64
Application Menu plugin for vala-panel
vala-panel-appmenu-common/bionic,bionic,now 0.6.94+repack1-1 all [installed,automatic]
Common files for Application Menu plugins
vala-panel-appmenu-registrar/bionic,now 0.6.94+repack1-1 amd64 [installed,automatic]
DBusMenu registrar for vala-panel
xfce4-appmenu-plugin/bionic 0.6.94+repack1-1 amd64
Application Menu plugin for xfce4-panelUninstall the MATE applet app menu and the vala panel appmenu and restart that should take care of it
Thanks so much Bernie. 
Got my menus back.
I do get one popup.
The panel encourntered a problem while loading AppmenuAppletFactory AppmenuApplet
Do you want to delete the applet from your configuration
Delete or dont deleteGo ahead and delete it's just a configuration left behind, you may have been able to just remove the menu from the panel to get your menus back but if you're not using them then you should be fine