Ubuntu – Ubuntu 18.04 Keystroke Alt + Shift + (Ctrl) + Down does not work

Found the answer myself using this guide: How To Reset Unity And Compiz In Ubuntu 14.04, 13.10 Or 13.04.

Installed dconf-tools:

sudo apt-get install dconf-tools

Did the reset:

dconf reset -f /org/compiz/

And restart Unity:

setsid unity

And then I rebooted just to be sure.

Finally, you need to re-enable workspaces after the reboot.

In the image below I have limited the number of keys by blacking out the ones that, in my opinion, would not really be used for this (enter,arrows, hardware etc) and coloured the keys to be modifiers in gray. This will give us a nice starting point.

This gives us, 6 modifier (mod) keys and 63 normal keys (key), so to get the amount of two key combinations we can do key*mod and get 378, call this A.

To get the number of three key combinations we have 6 mod keys and each can be paired with another, so each key can have 5 combos. If we do 6*5 we get 30 (com) and we can multiply this by key to get the number of three key combinations com*key is 1890 and call this B.

Finally we can add A to B and get the number of mappable shortcuts for Unity, within the given criteria.

A+B = 2268

To summarize:

mod*key + com*key = answer

You should be able to use this on any keyboard by assigning the numbers to the variables (key, mod, com) by counting them and then using the final equation to work out the number of possible shortcuts.

I am no mathematician but I think I did this right, please anyone feel free to tell me if I am not in the comments but I had to answer this, it was driving me nuts.