After Catalina upgrade “Desktop” can’t be opened because the original item can’t be found

Solution 1:

I had the same problem. I fixed it by removing Documents and Desktop from the Finder sidebar and then adding them back.

Here's how to do it

• Open Finder.
• On the Finder sidebar, right-click (or Ctrl-click) on Documents and choose Remove from Sidebar. Do the same thing for Desktop.
• On the menu bar at the top, click Finder and choose Preferences.
• Click the Sidebar tab at the top.
• Check the box for Documents and Desktop.
• Close the Finder Preferences window.

NOTE: I've read that some users have a similar problem that might be related to iCloud and having the Documents and Desktop folders synced there. I don't use iCloud for these things, so I can't say if the problem is also caused by that.