Yes. I feel your pain. That little bar at the bottom of your screen is no longer visible after you upgraded to macOS Catalina.
Well, here I am, to help you before Apple does.
Open a terminal.
How? — you may ask — my dock doesn’t exist. I don’t know how to open anythingCmd+Space to open spotlight, type terminal, but don’t press enter, yet, because the default for terminal sometimes is… terminal-notifier. How the hell spotlight decides those things? I don’t know.
Once you have a terminal, type the following
defaults delete com.apple.dock; killall Dock
You will now see your dock. However after restarting you will face the same issue.
So before restarting, I opened Finder, and then I launched the Go dialog into the following folder
To open the Go dialog (“Go to the folder”) press CMD+SHIFT+G
Once in the folder ~/Library/Application Support, you have to delete the folder Dock.
And now you can restart.
Note: The solution comes from here, but it is not the accepted answer.
First published here