System Settings - Keyboard - Shortcuts tab - Windows section - Disable "Activate the window menu"
Although this is only alt+space initially, disabling it removes all the alt+<key> window menu shorcuts. Since this is the case, this bug report can be aimed at making that description clearer.
Woohoo! It seems that this is already possible! I just read this comment on an SO question
http:// askubuntu. com/questions/ 124815/ how-do- i-enable- emacs-keybindin gs-in-google- chrome# comment332725_ 233539
System Settings - Keyboard - Shortcuts tab - Windows section - Disable "Activate the window menu"
Although this is only alt+space initially, disabling it removes all the alt+<key> window menu shorcuts. Since this is the case, this bug report can be aimed at making that description clearer.