[Bug 1460133] [NEW] muon-updater hangs with "Waiting for configuration file" on debconf question

[Vincas Dargis]

Public bug reported:

I was upgrading salt-master and salt-minion (installed from their
official PPA http://ppa.launchpad.net/saltstack/salt) with muon-updater
GUI, but upgrade process stopped on "Waiting for configuration file"
status message.

Original bug report with screenshot:
https://github.com/saltstack/salt/issues/23663

Apparently, muon-updater did not produce some kind GUI prompt to answer debconf question:
$ tail -f /var/log/apt/term.log
Configuration file '/etc/salt/master'
 ==> 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.
*** master (Y/I/N/O/D/Z) [default=N] ?

To reproduce:

Manually install older slat-minion, salt-common:
https://launchpad.net/~saltstack/+archive/ubuntu/salt2014-7-4/+files/salt-common_2014.7.4%2Bds-1trusty1_all.deb
https://launchpad.net/~saltstack/+archive/ubuntu/salt2014-7-4/+files/salt-minion_2014.7.4%2Bds-1trusty1_all.deb

Also, manually install their dependencies, but do not upgrade salt
itself:

$ sudo apt-get -f install dctrl-tools libpgm-5.1-0 libzmq3 python-
m2crypto python-msgpack python-yaml python-zmq

Then, change /etc/salt/minion line:
#master: salt
into
master: salt

Then, open muon-updater, check for available updates and proceed
installing latest salt-minion. Installation will not finish.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: muon-updater 2.2.0-0ubuntu3.2
ProcVersionSignature: Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10
Uname: Linux 3.16.0-38-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CurrentDesktop: KDE
Date: Fri May 29 18:38:58 2015
InstallationDate: Installed on 2013-12-05 (539 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: muon
UpgradeStatus: Upgraded to trusty on 2014-05-04 (389 days ago)

** Affects: muon (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1460133

Title:
  muon-updater hangs with "Waiting for configuration file" on debconf
  question

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