For future reference one annoying thing about the non-interactive
version of the upgrader is that it has its own exception handler e.g.:


class DistUpgradeViewNonInteractive(DistUpgradeView):
    " non-interactive version of the upgrade view "
    def __init__(self, datadir=None, logdir=None):
        DistUpgradeView.__init__(self)
        self.config = DistUpgradeConfig(".")
        self._acquireProgress = NonInteractiveAcquireProgress()
        self._installProgress = NonInteractiveInstallProgress(logdir)
        self._opProgress = apt.progress.base.OpProgress()
        sys.__excepthook__ = self.excepthook

Disabling sys.__excepthook__ allowed the real error, UnicodeDecodeError,
to surface.

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https://bugs.launchpad.net/bugs/1614576

Title:
  Upgrade from xenial to yakkety fails due to a UnicodeDecodeError

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