Public bug reported:

When upgrading from version 1.9-3ubuntu10.1, a previously working
machine can't successfully reboot completely.

ifup is hanging indefinitely, with this process structure (from "pstree
-a 1299"):

ifup,1299 -a
  └─run-parts,1501 /etc/network/if-pre-up.d
      └─bridge,1502 /etc/network/if-pre-up.d/bridge
          └─bridge,1508 /etc/network/if-pre-up.d/bridge
              └─vlan,1511 /etc/network/if-pre-up.d/vlan
                  └─ifup,1532 eth0


<begin content of /etc/network/interfaces>
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
  address 192.168.10.65
  netmask 255.255.255.192
  gateway 192.168.10.66

auto eth0.11
  address 192.168.11.1
  netmask 255.255.255.0

auto br1134
iface br1134 inet manual
  bridge_ports eth0.1134
  bridge_stp off
  bridge_fd 0
<end content of /etc/network/interfaces>

The underlying interface eth0.1134 is not explicitly defined, but was
previously auto-created during "ifup -a" execution. This apparently
fails now.

Reverting back to the 10.1 version re-establishes old behavior.

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

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https://bugs.launchpad.net/bugs/1701023

Title:
  (on trusty) version 1.9-3ubuntu10.4 regression blocking boot
  completion

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