I am on Linux Mint 18.1.
I'm trying to free-up Alt+combination via changing:
but it didn't help. How to unbind this system shortcut?
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Ok, found it!
First see this: https://forums.linuxmint.com/viewtopic.php?f=208&p=655543#p655476. It explains why custom shortcuts are not working in Mint 14 Cinamon and there is a workaround for this, a working one!
Now, when you restore "Keyboard" settings under System Tools -> System Settings, then simply go there and go to the Shortcuts tab. Then find "Switch windows of an application" and assign a shortcut. By default there is no key assigned so the default one (Alt +
) is used. But if you assign a different shortcut, which does work, then Alt + is no longer used! That allows you to assign that shortcut to anything else. In my case, I used that as an alternative shortcut for Toggle Scale, which can be set under Cinamon Settings -> Keyboard -> Keyboard shortcuts tab.