Keyboard repeat not working
Solution 1:
Go to system settings >> keyboard and make sure that repeat and speed are set correctly.
Solution 2:
In Ubuntu 18.04, somehow the settings works the other way around :
- Dragging Speed to the left completely, sets it to disabled
- Dragging Speed a little, sets it to fast repeat
- Dragging Speed to the right makes it slow (or normal)
Toggling the On/Off button seemed to fix it too.
PS : Config found in Settings > Universal Access > Typing