Thank you for your reply. I used the command following this guide https://www.youtube.com/watch?v=QhJiOCwz-_I -- if it's wrong, then I will not follow this guide anymore.
Yes, I have Fraktur.traineddata in usr/loca/share/tessdata I do not know how to change "the TESSDATA_PREFIX environment variable" -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to tesseract-ocr+unsubscr...@googlegroups.com. To post to this group, send email to email@example.com. Visit this group at https://groups.google.com/group/tesseract-ocr. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/25f7316b-424f-49f3-b33d-9a00fe5a1eaf%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.