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

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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

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment networking preseed
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netboot image for 18.04 broken with unattended install
https://bugs.launchpad.net/bugs/1748169
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