[Bug 1785768] Re: [bionic] net-installer dhcp client fails with DHCPDECLINE

[Oskar Liljeblad]

This happens to me too - most of the time but not always. I can't
identify why dhclient does DHCPDECLINE, the F4 log during installation
doesn't have the reason. It is worth noting that my isc-dhcp-server log
has warnings like these:

dhcpd[26608]: reuse_lease: lease age N (secs) under 25% threshold, reply
with unaltered, existing lease for X.Y.Z.W

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Title:
  [bionic] net-installer dhcp client fails with DHCPDECLINE

Status in netcfg package in Ubuntu:
  Confirmed

Bug description:
  During installation over PXE with a preseed file and with the netboot
  files the dhcp client fails with a DHCPDECLINE. Apparently it's a
  known issue which is often reiterated between each version according
  to this bugreport :
  https://bugs.launchpad.net/ubuntu/+source/netcfg/+bug/848072

  The client machine start over PXE and get with success all files which
  are needed to start the debian-installer. While it tries to configure
  the network the client sends a DHCPDECLINE and the network
  configuration fails.

  I have downloaded netboot.tar.gz file from this link :

  http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-
  amd64/current/images/netboot/netboot.tar.gz

  Ubuntu version:  18.04
  Installer build: 20101020ubuntu543

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