Bug#928031: failing here too

I have very similar issue: this part of preseed fails (did not fail in stretch), with error message - Could not reach repository (options are retry, modify or ignore - or something similar) (in syslog it says - Repository not signed) d-i mirror/country string manual d-i mirror/http/hostname string

Bug#782145: jessie failing on xenserver netboot

Package: installation-reports Boot method: network Image version: http://ftp.nl.debian.org/debian/dists/testing/main/installer-amd64/current/images/netboot/netboot.tar.gz Date: 8.4.2015 Machine: xenserver Processor: Memory: Partitions: NA Output of lspci -knn (or lspci -nn): Base System Install