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

[martin]

Unfortunately the workaround mentioned in comment #2 (older netboot
image from http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-
amd64/20101020ubuntu527/images/netboot/) is not an option as it throws
an error regarding missing kernel modules in the initrd –

"No kernel modules were found. This probably is due to a mismatch
between the kernel used by this version of the installer and the kernel
version in the archive.

If you're installing from a mirror, you can work around this problem by
choosing to install a different version of Ubuntu. The install will
probably fail to work if you continue without kernel modules"

However:

$ lsmod

Module
usb_storage
hid_generic
usbhid
hid
vga16fb
vgastate
ghash_clmulni_intel
pcbc
aesni_intel
aes_x86_64
crypto_simd
cryptd
glue_helper
e1000e
ptp
pps_core

$ uname -r
4.13.0-25-generic

$ ls /lib/modules
4.13.0-25-generic

So not really an accurate error message at all. I suspect it is simply
because it checks the Packages file and finds that there are newer
versions available on the mirror.

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https://bugs.launchpad.net/bugs/1748169

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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