I'm using Kubuntu 18.04 and recently my shortcut keys have stopped working.
Until now, I tried to delete the file kglobalshortcutsrc from ~ / .config / and also went to System Settings >> Shortcuts >> Global Shortcuts and tried to reset all of them in with the standard options.
For example, the shortcuts for changing from workplace are not working. Currently I have 6 workplace, but I can switch to just four of them using Crtl + F1, ...., Ctrl + F4. When I try to use Ctrl + F5, nothing happens. The shortcuts to manage the windows in different workplaces are also not working.