Public bug reported:

I had no networking when I booted up with systemd just now.

laney@raleigh> cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

laney@raleigh> ifconfig
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:572 errors:0 dropped:0 overruns:0 frame:0
          TX packets:572 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:46364 (46.3 KB)  TX bytes:46364 (46.3 KB)

laney@raleigh> more /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual

auto br0
iface br0 inet dhcp
    bridge_ports eth0
    bridge_stp off
    bridge_fd 0
    bridge_maxwait 0

laney@raleigh> sudo ifup eth0 br0
ifup: failed to open lockfile /run/network/.ifstate.lock: No such file or 
directory

Then copying from /etc/init/networking.conf's pre-start

laney@raleigh> sudo mkdir -p /run/network
laney@raleigh> sudo ifup -a
Internet Systems Consortium DHCP Client 4.2.4
Copyright 2004-2012 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/br0/30:85:a9:9d:63:f6
Sending on   LPF/br0/30:85:a9:9d:63:f6
Sending on   Socket/fallback
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 3 (xid=0x1b02ce25)
DHCPDISCOVER on br0 to 255.255.255.255 port 67 interval 7 (xid=0x1b02ce25)
DHCPREQUEST of 192.168.1.136 on br0 to 255.255.255.255 port 67 (xid=0x1b02ce25)
DHCPOFFER of 192.168.1.136 from 192.168.1.1
DHCPACK of 192.168.1.136 from 192.168.1.1
bound to 192.168.1.136 -- renewal in 39350 seconds.
laney@raleigh> cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.1.1

I feel like there's probably an existing systemd-ish way of doing this.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ifupdown 0.7.47.2ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Apr 25 18:01:25 2014
InstallationDate: Installed on 2012-10-07 (564 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20121007)
SourcePackage: ifupdown
UpgradeStatus: Upgraded to trusty on 2013-05-07 (353 days ago)

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug systemd-boot third-party-packages trusty

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https://bugs.launchpad.net/bugs/1312836

Title:
  Doesn't bring up interfaces from /etc/network/interfaces

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