just installed the mate 15.10 edition I am a keyboard type of guy.
- what is the keyboard shortcut to activate default shutdown, reboot, cancel etc menu? 2. and also to activate “control center”
For shutdown it is CTRL/ALT/DEL
For logout I don’t know
Keyboard shortcuts vary by version, I think it originally was set to shut down (14.04), but now CTRL+ALT+DEL shows the logout dialog.
CTRL+ALT+DEL seems to open the System Monitor for me (15.10) despite it being set to log out... 
(Could be Compiz overriding this?)
Shortcuts can be found and assigned under System → Preferences → (Hardware) → Keyboard Shortcuts.
To assign your own custom shortcuts to different programs, bind the command to a key of your choice:
Shutdown dialog:
mate-session-save --shutdown-dialog
Logout dialog:
mate-session-save --logout-dialog
You may also find this useful.
works great, exactly what I was looking for.
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