the initrd causes this issue. It contains the http and ftp files but it seems that these files are linked (when i unpack it on another machine cpio raises a warning). I corrected this issue on my machine by deleting the ftp and http file and recreate them and then recreate the initrd.
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[netboot] /lib/preseed/fetch-methods/{ftp,http} empty
https://launchpad.net/bugs/94786
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