Today somehow my Super key is disabled. I can't use it, neither the laptop keyboard nor external keyboard. When I press the Super key, it does not send the Super key signal to ubuntu (18.04 LTS). Somehow it changed.
I checked the Super key by
xev command. Here is the output:
KeyRelease event, serial 37, synthetic NO, window 0x3400001, root 0x176, subw 0x0, time 4735544, (559,365), root:(661,519), state 0x2010, keycode 133 (keysym 0xfe08, ISO_Next_Group), same_screen YES, XLookupString gives 0 bytes: XFilterEvent returns: False
I have some key binding with Super key. I use keyboard shortcut for changing writing language, opening dash, changing window/application etc.
Please tell me how to enable the key.
The problem seems to occur after every shutdown. There might be an application which is overriding the key. Instead of running the command every time, I have figured out another simple way. See the updated answer.