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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