If you're preparing a paper for a conference submission or if you just want to ensure that your .pdf looks exactly the same on someone else's computer as it does on yours, then you need to know how to embed the fonts used in your pdf in the file itself. In this article, I'll show you how to do this in Linux and how to verify that you've done it successfully. If you want information about doing this in Windows, check how to embed fonts in pdfs in Windows.