As per title.
On the Mate system menu, there are two items: "help" and "about mate". I am wanting to remove these two items from the system menu on a Frankenstein Linux system /i am building which includes Mate Panels, but isn't actually the Mate Desktop. But, there is no obvious way to remove these items that I have found.
If anyone knows how, I would be grateful for this information
See screen-shot below:
I was in a 16.04 VM so tried renaming these and it worked. They didn’t originally have “.disabled” in their name:
/usr/share/applications/About MATE.disabled.desktop
/usr/share/applications/Help.disabled.desktop
Do they exist in your Frankenstein? And be warned it’s an uneducated hack. 
Cheers Bill. Deleted them and voila. They’re gone from the menu…
The system is actually Ubuntu Studio which is ostensibly XFCE4.
But, I have swapped out XFCE4-Panel for the Mate-Panel and have also replaced Thunar with Caja
It’s working pretty well in a VM.
How do you remove the lockscreen buttom?
Install dconf-editor, if it is not already installed:
sudo apt-get install dconf-tools
Then open dconf-editor (it’s under “applications/tools”)
Navigate to “org/mate/desktop” and check “disable lock screen”