I recreated the initrd by copying the http-file to a different name, then removing the old files, renaming again to http and then symlinked ftp to it and repackaged the initrd. That made it work again.
-- [netboot] /lib/preseed/fetch-methods/{ftp,http} empty https://launchpad.net/bugs/94786 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs