update: I got killall mate-menu assigned to a keyboard shortcut, but it keeps asking me to prompt restarting it, which works but I can only click it with the mouse.
Hi Theblob,
I hope to be useful to you. I do this: to set the keyboard shortcuts I go to System → Preferences → Hardware → Keyboard Shortcuts. If I want to kill a process, from the terminal I give the command ‘ps ax’ to get the list of active processes; each process is marked with a number at the beginning of the line; then I give the command ‘kill -9 process number’ to kill the process I want to kill. Note that to kill some processes you need to be logged in as root