[Bug 1614576] Re: Upgrade from xenial to yakkety fails due to a UnicodeDecodeError

[Brian Murray]

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

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged

Bug description:
  When doing an automated upgrade from xenial to yakkey, I get:
  Preparing to unpack .../policykit-1_0.105-16_amd64.deb ...
  Created symlink /run/systemd/system/polkitd.service auto-upgrade [10:48:43]: ERROR: ERROR: Something went wrong with the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: policykit-1 0.105-16
  ProcVersionSignature: User Name 4.4.0-34.53-generic 4.4.15
  Uname: Linux 4.4.0-34-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  Date: Thu Aug 18 11:02:06 2016
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: policykit-1
  UpgradeStatus: Upgraded to yakkety on 2016-08-18 (0 days ago)

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