Public bug reported:

I've got a number of automatic upgrade tests running daily, which all
use the noninteractive frontend. As of a few days ago, the
trusty->xenial amd64 desktop qemu uefi upgrade testing is having
problems:

Setting up sane-utils (1.0.25+git20150528-1ubuntu2) ...
Installing new version of config file /etc/default/saned ...
Installing new version of config file /etc/init.d/saned ...
Test for running scanbd
Move homedir from /home/saned to /var/lib/saned
 * saned disabled; edit /etc/default/saned
Setting up shim-signed (1.17~16.04.1+0.8-0ubuntu2) ...
Installing for x86_64-efi platform.
Installation finished. No error reported.
find: Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in 
apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 15, in <module>
    import xml.dom, xml.dom.minidom
ImportError: No module named 'xml.dom'

Original exception was:
Traceback (most recent call last):
  File "/tmp/ubuntu-release-upgrader-xv9kbqfl/xenial", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeMain.py", 
line 242, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeController.py", 
line 1876, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeController.py", 
line 1841, in fullUpgrade
    if not self.doDistUpgrade():
  File 
"/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeController.py", 
line 1182, in doDistUpgrade
    res = self.cache.commit(fprogress,iprogress)
  File "/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeCache.py", 
line 267, in commit
    apt.Cache.commit(self, fprogress, iprogress)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 501, in commit
    # which is less than optimal!
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 465, in 
install_archives
    
  File "/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeView.py", 
line 234, in run
    res = os.WEXITSTATUS(self.wait_child())
  File "/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeView.py", 
line 200, in wait_child
    self.update_interface()
  File 
"/tmp/ubuntu-release-upgrader-xv9kbqfl/DistUpgrade/DistUpgradeViewNonInteractive.py",
 line 229, in update_interface
    sys.stdout.write("%s" % s.decode(locale.getpreferredencoding()))
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe2 in position 0: 
unexpected end of data
auto-upgrade [16:53:31]: ERROR: ERROR: Something went wrong with the upgrade.

I can get more output if necessary. This problem doesn't appear to occur
on other trusty->xenial amd64 desktop qemu installs, so I'm uncertain if
it's related to a package installed to support the UEFI boot or some
other difference between that and the other images.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1604160

Title:
  Unicode decode error in noninteractive frontend on t->x

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