[Bug 1720244] Re: Leaving DNS blank during install, network doesn't come up after post-install boot

[Frank Heimes]

*** This bug is a duplicate of bug 1667296 ***
    https://bugs.launchpad.net/bugs/1667296

With the change to netplan this is fixed on 18.04.
(just tested with a VM guest installation of 18.04)

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https://bugs.launchpad.net/bugs/1720244

Title:
  Leaving DNS blank during install, network doesn't come up after post-
  install boot

Status in debian-installer package in Ubuntu:
  New
Status in netcfg package in Ubuntu:
  New

Bug description:
  If at d-i step "Domain name specification"
  the domain is just left blank (nothing specified):
  Domain name: <blank>
  The installation completes without errors, but the network does not get up after the post-install reboot.

  Found these msgs in the logs:
  Sep 28 13:23:11 debootstrap: /etc/network/interfaces:21: option with empty value
  Sep 28 13:23:11 debootstrap: ifquery: couldn't read interfaces file "/etc/network/interfaces"
  Sep 28 13:23:11 debootstrap: ifquery: no interface(s) specified
  Sep 28 13:23:11 debootstrap: ifquery: Use --help for help

  Full log see attachment.

  Line #21 in /etc/network/interfaces is 'dns-search':
  cat /etc/network/interfaces
  # This file describes the network interfaces available on your system
  # and how to activate them. For more information, see interfaces(5).

  source /etc/network/interfaces.d/*

  # The loopback network interface
  auto lo
  iface lo inet loopback

  # The primary network interface
  auto encc000.2653
  iface encc000.2653 inet static
  	address 10.245.236.12
  	netmask 255.255.255.0
  	network 10.245.236.0
  	broadcast 10.245.236.255
  	gateway 10.245.236.1
  	vlan_raw_device encc000
  	# dns-* options are implemented by the resolvconf package, if installed
  	dns-nameservers 0.0.0.0
  	dns-search

  Changing to:
  	dns-search canonical.com
  or re-installing and specifying 'canonical.com' as Domain name (just as an example) works.

  The system should come up after an installation even if DNS is empty.

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