[Bug 1748169] Re: netboot image for 18.04 broken with unattended install

[Reinhard]

Just tested my preseeded-installation with the new netboot-image uploaded on 2018-02-19 and installation worked as expected. 
There where NO problems with dns resolution or networkconfiguration via dhcp.
Thanks :-)

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Title:
  netboot image for 18.04 broken with unattended install

Status in debian-installer package in Ubuntu:
  Confirmed

Bug description:
  It looks like that the netboot image found in 
  "/ubuntu/dists/bionic/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64" upload date 2.2.2018 
  is broken for unattended install.

  With a preseed file, which was working with 16.04, 17.10 and 18.04 at the beginning the installation stop after trying to get network-configuration via dhcp.
  It looks like only a dhcp request for ip6 is done.

  Further it looks like, if there is a problem with dns resolution,
  because after a manual network-configuration is done, the download of
  the preseed-file (url from kernel startparameter) fails, with error-
  message >>tftp01<< not found.

  url from kernel startparameter:
  kernel ubuntu-installer/18.04/amd64/linux
  append auto=true priority=critical url=tftp://tftp01/preseed/systemd/preseed_2P_1F_2F.cfg vga=788 initrd=ubuntu-installer/18.04/amd64/initrd.gz -- quiet

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