Use pdffonts -subst to see actual substitution. Then force substitution via Ghostscript’s -sSubstFont=... .
Linux servers are the most common place where cidfont f1 f2 f3 f4 f5 f6 install errors occur. Ghostscript on Linux uses a Fontmap file to redirect generic names to actual font files. cidfont f1 f2 f3 f4 f5 f6 install
(TeX’s dvips/pdfTeX): /usr/local/texlive/texmf-local/fonts/type1/ or …/cid/ Use pdffonts -subst to see actual substitution
Most "F1-F6" errors are caused by missing CJK (Chinese, Japanese, Korean) support. Korean) support. cannot be found
cannot be found, you aren't alone. This issue typically arises when a PDF was exported from software that failed to properly embed the original fonts.