[Bug 1382707] Re: trusty->utopic non-interactive upgrade outputs garbage, and is interactive

[IDHAN]

I can confirm this is still an issue on Xenial LTS when upgrading to Bionic LTS.
I do an 'do-release-upgrade -d -f DistUpgradeViewNonInteractive' and I'm prompted when the installation procedure comes to the user-changed etc-files. Despite entering an answer, the installation then hangs and does not proceed.

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https://bugs.launchpad.net/bugs/1382707

Title:
  trusty->utopic non-interactive upgrade outputs garbage, and is
  interactive

Status in update-manager-core package in Ubuntu:
  Confirmed

Bug description:
  Updating from Trusty 14.04.

  Steps to reproduce:

  sudo apt-get install update-manager-core python-apt
  sudo sed -i -e 's/Prompt=lts/Prompt=normal/' /etc/update-manager/release-upgrades
  sudo do-release-upgrade -d -f DistUpgradeViewNonInteractive

  After while, it shows text that looks like: b'\r'b'E'b'x'b't'b'r'b'a'b'c'b't'b'i'b'n'b'g'b'. You can extract some meaning out of it using sed to remove the 'b':
  sed -e "s/'b'//g" upgrade.log | sed -e 's/\\r\\n/|/g' | tr '|' '\n'

  And I can see that the upgrade is actually interactive:
  ---
  Configuration file 'b"'"b'/etc/upstart-xsessions'b"'"b'
   ==> 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'b"'"b'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.
  *** upstart-xsessions (Y/I/N/O/D/Z) [default=N] ? '
  ---

  This used to work fine (precise->trusty, saucy->trusty). Is there a
  new frontend that replaces DistUpgradeViewNonInteractive?

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