Originally Posted by Jellby
Since this is unrelated to the epub->pdf conversion, I suggest you create a new thread either here in the ePub forum or in the Sigil one. Your problem with the images was that there were many references in the css file, just remove the unused styles, or add the images.
I fixed the problem and I wanted to inform you about it
The problem was, that after validating the epub with sigil, sigil url-encoded the links to the image files! So the links get changed from something like "../Imagesfirstname.lastname@example.org" to "../Images/privat%40images.jpeg" which can not be found by prince later...
Thanks for your help, my task is completed