[Bug 1765765] Re: on nfsboot 18.04 bionic, internet addresses arn't resolve properly

[Guillermo]

Hi Brian,

No, I had to remove it since including it triggered some errors during boot.
IIRC, one was "failed to raise network interfaces". I've tried with 18.04.2 and networking works, but there's only the raising network interfaces error.

In both cases, gnome says that networking is "unmanaged". Does it make
sense?

Here's an extract from syslog under 18.04.2 with ip=dhcp:
Feb 20 07:14:06 ubuntu avahi-daemon[924]: Failed to open /etc/resolv.conf: Invalid argument
Feb 20 07:14:07 ubuntu NetworkManager[909]: <warn>  [1550646847.4309] Error: failed to open /run/network/ifstate
Feb 20 07:14:09 ubuntu ifup[1367]:Error: any valid prefix is expected rather than "dhcp/dhcp".
Feb 20 07:14:09 ubuntu ifup[1367]: Failed to bring up dhcp.
Feb 20 07:14:09 ubuntu systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Feb 20 07:14:09 ubuntu systemd[1]: networking.service: Failed with result 'exit-code'.
Feb 20 07:14:09 ubuntu systemd[1]: Failed to start Raise network interfaces.ls -la


The invalid argument error is also present when I boot without ip=dhcp, but that's all.

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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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