Wouldn't this change be causing the issue?

update-notifier (3.164) xenial; urgency=medium
  ...
  * debian/99update-notifier:
    - Now additionally triggers the an asynchronous background update of the
      cached info via update-motd-updates-available hooking into 
      APT::Update::Post-Invoke-Success.

Here's the contents of 99update-notifier:

  1 DPkg::Post-Invoke {"if [ -d /var/lib/update-notifier ]; then touch 
/var/lib/update-notifier/dpkg-run-stamp; fi";};
  2 APT::Update::Post-Invoke-Success 
{"/usr/lib/update-notifier/update-motd-updates-available 2>/dev/null || true";};

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https://bugs.launchpad.net/bugs/1527710

Title:
  apt-get update triggers asynchronous task

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