The ubuntu-fan autopkgtest regressions are unrelated and a fix for them
has just been accepted into xenial-proposed (ignoring stderr output).
Ignoring the failure for now and releasing.

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https://bugs.launchpad.net/bugs/1642514

Title:
  sched: Match-all classifier is missing in xenial

Status in iproute2 package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in iproute2 source package in Xenial:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  [SRU Justification]

  == Impact ==
  The Xenial 4.4 kernel already has a patch applied which implements the 
matchall filter. But in order to actually use it, iproute2 needs to pick up the 
user-space
  side of the implementation.

  == Fix ==
  Backported a patch from iproute2 upstream which adds the missing support. 
Tested against the standard 4.4 and the HWE kernel in 16.04 (see testcase).

  == Risk of Regression ==
  This adds a new filter type which has to be actively selected. This should 
not impact existing uses. So low.

  == Testcase ==
  ip link add dev dummy0 type dummy
  ip link add dev dummy1 type dummy
  ip link set dev dummy0 up
  ip link set dev dummy1 up
  tc qdisc add dev dummy0 handle 1: root prio
  tc filter add dev dummy0 parent 1: matchall skip_hw action mirred egress 
mirror dev dummy1

  at this point, "tc filter show dev dummy0" should spit out something
  like:

  filter parent 1: protocol all pref 49152 matchall 
  filter parent 1: protocol all pref 49152 matchall handle 0x1 
          action order 1: mirred (Egress Mirror to device dummy1) pipe
          index 1 ref 1 bind 1
   
  and the functionality can be tested via

  tcpdump -n -i dummy1 &
  ping -I dummy0 1.2.3.4

  ---

  This is implemented in linux v4.8 by the following upstream patch:
  bf3994d2ed31 ("net/sched: introduce Match-all classifier")

  
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bf3994d2ed31

  The backport is straightforward. It's useful in combination with
  clsact qdisc (see bug #1642510).

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