[Bug 1205523] [NEW] qapt-deb-installer fails to detect and report some installation errors

[Francois Gouget]

Public bug reported:

Here is how to reproduce this bug:
 * Download http://fgouget.free.fr/bugs/testdep.tar.bz2
   This is a small archive that contains a set of test, empty, Debian 
   package files along with their source.
   (run ./build to rebuild them)

 * Install the testdep-allsarch_1.0-1_all.deb package.

 * Then run the following command and install the package:
   qapt-deb-installer testdep-allsarch-default_1.0-1_i386.deb

The command will appear to succeed but in fact it leaves the testdep-
allsarch-default broken:

$ dpkg -l testdep-allsarch-default
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                 Version         Architecture    Description
+++-====================-===============-===============-=============================================
iU  testdep-allsarch-def 1.0-1           i386            Package with testdep-allsarch dependency

Now it's normal for the package to fail to install: it has a dependency
that cannot  be resolved. But there are still two bugs here:

* The most important one is that qapt-deb-installer seems to fail to
detect and report unexpected installation errors. This is the bug that
really needs to be fixed. Note that in the same situation gdebi-gtk and
software-center detect and report the issue and also suggest a command
to run to fix it.

* The second, less important bug, is that qapt-deb-installer thought the
package could be installed in the first place.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: qapt-deb-installer 2.0.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
Uname: Linux 3.8.0-26-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: amd64
Date: Fri Jul 26 18:58:24 2013
InstallationDate: Installed on 2013-04-29 (88 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
SourcePackage: qapt
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug raring

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https://bugs.launchpad.net/bugs/1205523

Title:
  qapt-deb-installer fails to detect and report some installation errors

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