So, as best as we can tell, this is caused by an upgrade to Qt.
Specifically, anything that uses QDBus is falling over. We are seeing
similar problems with unity-scope-click here:

Basically, the code works with Qt 5.5, and doesn't with Qt 5.6. The ftbs
for thumbnailer here

shows that the tests failed only on yakkety arm64 and ppc64el. That's
because that silo was built before Qt 5.6 was added to the Xenial
overlay. If I were to build in a silo now, I expect I'd see the same
failures on both xenial and yakkety.

Not sure what we can do to help here. The problem isn't in the
thumbnailer code, but somewhere in QDBus, by the looks of things.

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Touch seeded packages, which is subscribed to thumbnailer in Ubuntu.

  [MIR] thumbnailer

Status in thumbnailer package in Ubuntu:

Bug description:
   * Available in universe

   * This package is required by many Ubuntu Touch applications and scopes, 
such as gallery app, music app, today scope, music scope, etc.

   * No known security issues at this time. It has been reviewed by security in 
the past for use on the phone.

  [Quality assurance]
   * This package has unit tests.

   Most dependencies are already in main with the exception of the following:
   * libboost-filesystem-dev
   * libunity-api-dev (Bug #1613563)
   * persistent-cache-cpp-dev (Bug #1613560)

   Note that the package has other dependencies that are not in main,
  but these are used only for the tests and are not runtime

  [Standards compliance]
   * This package uses cmake.

   * This package is maintained by Canonical and actively in use on the phone 

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