Also preseed mirror/suite to prevent choose-mirror to try a bad suite

config/debian-installer/preseed.cfg

@@ -1,6 +1,7 @@
 # Hence those questions are not used/needed in general but they
 # are still needed for PXE install so keep them preseeded anyway
 d-i mirror/country string enter information manually
+d-i mirror/suite string kali
 d-i mirror/codename string kali
 d-i mirror/http/hostname string repo.kali.org
 d-i mirror/http/directory string /kali