The only solution is to remake the PDF properly or install the fonts on your system so you can embed them in your output.
Thank you. However, I have installed (or already have) all of the fonts missing. It's usually the basics, Arial, Helvetica, etc.
Also, how do I "remake the PDF prperly"? (Some of my linked PDFs are sent to me from clients, other companies, etc.)
You don't remake the PDFs from your clients, you contact them and instruct them in embedding fonts so they can remake them, and so it doesn't happen again.
Possible that the fonts are not embedded in supplied content.
You should check all your content for embedded fonts.