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

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