Values cannot be changed in CompizConfig System Manager (CCSM) when using <super>

Solution 1:

Found a workaround but still don't understand why the super key is locked from usage.

Steps for the workaround:

1. Change the key in CCSM to something without super (Should work).

2. Find the new key in dconf dump. dconf dump / | less + search for the new key combination. Found something of the following:

[org/compiz/profiles/unity/plugins/grid]

put-maximize-key='<Control><Alt>Up'

put-restore-key='<Control><Alt>Down'

left-maximize='<Alt>Left'

3. Write the new value. Example:

dconf write /org/compiz/profiles/unity/plugins/grid/left-maximize "'<Super><Control>Left'" (see the left-maximize in the command)

4. Check that it was written correctly:

$ dconf read /org/compiz/profiles/unity/plugins/grid/left-maximize

'<Super><Control>Left'