How to Remove Duplicate Icons in Launchpad

To eliminate duplicate icons in Launchpad

1. Run  Terminal

2. Type  sudo rm ~/Library/Application\ Support/Dock/*.db
               to remove the problematic Launchpad database

3. Enter user password to permit change

4. Type  sudo killall Dock
_             
to recreate a new database

5. Exit  Terminal

Note:
A free app called Launchpad-control can do above resetting with just a few clicks.

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