I want to remap my workspace switcher shortcut to a single key, specifically the Page Up/Page Down keys for going to the top/bottom workspace. But Ubuntu will not let me do this using System settings > Keyboard > Shortcuts, giving the following warning:
The shortcut "Page up" cannot be used because it will become impossible to type using this key. Please try with a key such as Control, Alt or Shift at the same time.
Is there any other way to remap shortcuts to a single key? Help is appreciated!