How do I fix the GPG error “NO_PUBKEY”?

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By far the simplest way to handle this now is with Y-PPA-Manager (which now integrates the launchpad-getkeys script with a graphical interface).

  1. To install it, first add the webupd8 repository for this program:
    sudo add-apt-repository ppa:webupd8team/y-ppa-manager
    
  2. Update your software list and install Y-PPA-Manager:
    sudo apt-get update
    sudo apt-get install y-ppa-manager
    
  3. Run y-ppa-manager (i.e. type y-ppa-manager then press enter key).
  4. When the main y-ppa-manager window appears, click on “Advanced.”
  5. From the list of advanced tasks, select “Try to import all missing GPG keys” and click OK.

    Reference

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