[Bug 1797636] Re: unattended do-release-upgrade to cosmic asks about /etc/gdm3/custom.conf

[Jeremy Bicha]

** Package changed: gdm3 (Ubuntu) => ubuntu-release-upgrader (Ubuntu)

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https://bugs.launchpad.net/bugs/1797636

Title:
  unattended do-release-upgrade to cosmic asks about
  /etc/gdm3/custom.conf

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

Bug description:
  I'm trying to do some automated testing that involved upgrading a
  system from bionic to cosmic, so I need it to not ask for user input.

  Before running do-release-upgrade, the system got a fresh dist-upgrade
  and reboot.

  To avoid interactive responses, I'm using:
  $ sudo do-release-upgrade -d -f DistUpgradeViewNonInteractive

  Part way through the upgrade, I do get prompted for something though:
  Setting up gdm3 (3.30.1-1ubuntu1) ...

  Configuration file '/etc/gdm3/custom.conf'
   ==> 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.
  *** custom.conf (Y/I/N/O/D/Z) [default=N] ?

  I also found this in /var/log/dist-upgrade/main.log:
  2018-10-12 16:36:44,910 WARNING got a conffile-prompt from dpkg for file: '/etc/gdm3/custom.conf'
  2018-10-12 16:36:49,915 ERROR error 'a bytes-like object is required, not 'str'' when trying to write to the conffile

  Shouldn't the '-f DistUpgradeViewNonInteractive' have prevented this
  from getting asked?

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