Since upgrading to Mojave my dashboard won't open.

Thanks! I can only get to Mission Control from the system preferences, not from the dock. From there, I was successful in changing the dashboard from "as space" to "as overlay" and it now comes up from my dock. However, below that, under keyboard and mouse shortcuts, the only thing that will work is the dashboard using F12. None of the other shortcuts work. I can still only open the launchpad and mission control from applications, not the dock.

As far as I can remember, all of these have always been in my dock on at least three Macs that I've owned. Nothing happens when I click on Launch Pad or Mission Control from my dock and neither one will open from applications. I can only access Mission Control from preferences and that is not Mission Control itself but the preferences page.

I just did a restart and all seems to be in order now. However, since upgrading to Mojave, the restarts take at least five minutes to complete. I still had the dock/dashboard problems with Mission Control, Launch Pad after having done multiple shut downs and restarts since upgrade. In the future, I do a restart before hitting the forums. Thank you very much for the rapid response and suggestions. Merry Christmas!