I had this issue too upon installing, starting and restarting apt-cacher-ng.
I found that i had a apparmor profile for apt-cacher-ng that was in enforce 
mode this was causing the installing, starting and restarting issues of 
apt-cacher-ng.
(I'm not sure if the apparmor profile is provided by apt-cacher-ng. )
But is resolved the issues of apt-cacher-ng by running:
sudo aa-complain usr.sbin.apt-cacher-ng

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https://bugs.launchpad.net/bugs/1512780

Title:
  apt-cacher-ng can't be installed on xenial

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