Public bug reported:

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.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: s390x

** Attachment added: "log.txt"
   https://bugs.launchpad.net/bugs/1720244/+attachment/4958281/+files/log.txt

** Also affects: debian-installer (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: linux (Ubuntu)

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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

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/1720244/+subscriptions

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