@Guillermo
The OS shouldn't be trying to raise the interface as it's already configured 
during the boot process. You can't reconfigure the network interface while 
you're booting from the network :)
You need to modify /etc/network/interfaces on your boot server to set the 
interface to manual. See step 5 under 'creating your NFS installation' on this 
page
https://help.ubuntu.com/community/DisklessUbuntuHowto

Related to this, I also set 'net.ifnames=0' in the kernel boot line so
the network devices are always named ethX rather than hardware-specific
names. That's personal preference though.


@beta-tester
Strange. Without specifying 'ip=dhcp' perhaps it was sometimes getting a bootp 
or rarp response without a DNS server settings? Just a guess. If 'ip=X' isn't 
set, it defaults to any autoconfig protocol. I'd suggest setting the ip option 
specifically to dhcp if that's what you expect it to use.
https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt

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Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1765765

Title:
  on nfsboot 18.04 bionic, internet addresses arn't resolve properly

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  since ubuntu 17.10, 18.04, when i nfsboot into ubuntu live an internet 
address isn't resolved properly.
  i always have to put a dns server to the /etc/resolv.conf file by hand to get 
address resolving to work again.

  it wasn't an issue in ubuntu 16.04 and not an issue in ubuntu 17.04.
  it began to be an issue starting with ubuntu 17.10 and ist still an issue now 
18.04 daily-live.

  the different between /etc/resolv.conf of ubuntu <=17.04 and utuntu >=17.10 
is, that now only one entry is in the resolv.conf file with IP 127.0.0.53
  in the erlier version there was an additional entry on top with the IP of the 
local DNS server(router).

  when i nfsboot ubuntu 18.04, adjust the /etc/resolv.conf file by hand to get 
internet address resolving to work,
  when i then install ubuntu 18.04 from that environment to the local 
harddrive, the networksettings on the newly installed local harddisk is always 
setted up to "manual" IP in the /etc/network/interfaces - so it will not get a 
proper IP from the router.
  after a new installation, i always have to set it up "dhcp" to get the IP 
from the router as usual.

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