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

[Frederik Carlier]

I have encountered a similar issue with the Ubuntu installer.

It turned out that the DHCP server was providing DNS server information,
but the DNS server itself was not reachable.

It appears that dhclient does some verification of the DHCP settings
offered, and rejects the IP address if the configration is invalid (e.g.
the nameserver is not reachable).

Unfortunately, there is no logging which indicates what settings
dhclient is verifying and which configuration error causes dhclient to
reject the IP address being offered.

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https://bugs.launchpad.net/bugs/1785768

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

Status in netcfg package in Ubuntu:
  New

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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