Similar issue:

Configuration file '/etc/default/rcS'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** rcS (Y/I/N/O/D/Z) [default=N] ?
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-q8tt9j6b/xenial", line 8, in <module>
    sys.exit(main())
  File "/tmp/ubuntu-release-upgrader-q8tt9j6b/DistUpgrade/DistUpgradeMain.py", 
line 242, in main
    if app.run():
  File 
"/tmp/ubuntu-release-upgrader-q8tt9j6b/DistUpgrade/DistUpgradeController.py", 
line 1876, in run
    return self.fullUpgrade()
  File 
"/tmp/ubuntu-release-upgrader-q8tt9j6b/DistUpgrade/DistUpgradeController.py", 
line 1841, in fullUpgrade
    if not self.doDistUpgrade():
  File 
"/tmp/ubuntu-release-upgrader-q8tt9j6b/DistUpgrade/DistUpgradeController.py", 
line 1182, in doDistUpgrade
    res = self.cache.commit(fprogress,iprogress)
  File "/tmp/ubuntu-release-upgrader-q8tt9j6b/DistUpgrade/DistUpgradeCache.py", 
line 286, 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-q8tt9j6b/DistUpgrade/DistUpgradeView.py", 
line 234, in run
    res = os.WEXITSTATUS(self.wait_child())
  File "/tmp/ubuntu-release-upgrader-q8tt9j6b/DistUpgrade/DistUpgradeView.py", 
line 200, in wait_child
    self.update_interface()
  File 
"/tmp/ubuntu-release-upgrader-q8tt9j6b/DistUpgrade/DistUpgradeViewNonInteractive.py",
 line 221, in update_interface
    os.write(self.master_fd,chr(3))
TypeError: 'str' does not support the buffer interface

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https://bugs.launchpad.net/bugs/1661849

Title:
  Unattended do-release-upgrade fails with Python import error

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