First, I'm not sure what window manager is running on my Mint installation. The "Control Center" yields no clues. Nevertheless - whatever I have is grabbing the emacs "meta" key (the option key on my Mac) and dropping down a window menu.
Being a Mac person, I could do without any of those option key shortcuts into the menus. Is there a way to turn them off completely? Barring that, is there a way to at least tell the manager to listen for some obscure key, so that I can get my meta keystrokes into emacs?