Public bug reported:

The "enable disable fan test" will fail with Xenial KVM kernel

Error message:
  RTNETLINK answers: Operation not supported
  /usr/sbin/fanctl: ip link add ftun0 type vxlan id 16384000 dev ens4 dstport 0 
local fan-map
  /usr/sbin/fanctl: WARNING: ftun0: failed to configure address translation
  RTNETLINK answers: Cannot assign requested address
  iptables v1.6.0: Couldn't load target `fan-egress':No such file or directory

  Try `iptables -h' or 'iptables --help' for more information.
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: Bad rule (does a matching rule exist in that chain?).
  iptables: No chain/target/match by that name.
  rm: cannot remove '/run/ubuntu-fan/nat-core': No such file or directory
  /usr/sbin/fanatic: unable to bring fan up, unable to configure

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-1021-kvm 4.4.0-1021.26
ProcVersionSignature: User Name 4.4.0-1021.26-kvm 4.4.117
Uname: Linux 4.4.0-1021-kvm x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
Date: Thu Apr 12 10:22:57 2018
 PATH=(custom, no user)
SourcePackage: linux-kvm
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux-kvm (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug package-from-proposed uec-images xenial

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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  ubuntu_fan_smoke_test failed on 4.4 X-kvm kernel

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