at the properties of the PDF files, they all contain the font, CairoFont.
... Cairo graphics library makes it easy to embed custom fonts in PDFs
Try adding device=cairo_pdf to the ggsave() call. This appears to solve the problem for me. This way, it's no longer necessary to use ...
If you want to save the scatter plot as a PDF file, then the standard route is
There are a couple issues at play here: (1) loading fonts into R and (2) using
Subject: cairo snapshot 1.15.4 now available A new cairo snapshot 1.15.4
Next, you must embed the font into the PDF file to make it render properly
The PDF backend has gained support for a range of widely used features,
(png/tiff with transparent background), "pdf" PDF-file with embedded fonts,
Font Combinations, a download pack of my recommended fonts, and a PDF