How to: export only notes to PDF from LibreOffice Impress 5

If you have a PDf printer installed (most Linux distributions, and Windows 10), just do File -> Print,
then under the Print sub-header choose Notes from the Document drop-down (see picture).
Make sure to set the proper paper format for the PDF printer (A4 in my case).
Then print, and save the resulting PDF.

Sources:

• question on ask.libreoffice.org
• LibreOffice bug report