[Bug 1553416] Re: kernel_oops crashed with AssertionError in get_system_architecture()

[Benjamin Drung]

whoopsie-upload-call can run into the same crash (bug #1999036):

```
Traceback (most recent call last):
  File "/usr/share/apport/whoopsie-upload-all", line 178, in <module>
    stamps = collect_info()
  File "/usr/share/apport/whoopsie-upload-all", line 128, in collect_info
    res = process_report(r)
  File "/usr/share/apport/whoopsie-upload-all", line 69, in process_report
    r.add_package_info()
  File "/usr/lib/python3/dist-packages/apport/report.py", line 380, in add_package_info
    dep, v, self._customized_package_suffix(dep))
  File "/usr/lib/python3/dist-packages/apport/report.py", line 294, in _customized_package_suffix
    mod = packaging.get_modified_files(package)
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 387, in get_modified_files
    sumfile = '/var/lib/dpkg/info/%s:%s.md5sums' % (package, self.get_system_architecture())
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 539, in get_system_architecture
    assert dpkg.returncode == 0
AssertionError
```

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https://bugs.launchpad.net/bugs/1553416

Title:
  whoopsie-upload-all/kernel_oops crashed with AssertionError in
  get_system_architecture()

Status in apport package in Ubuntu:
  Triaged

Bug description:
  Fresh Install.  That was after running Software updater for the first
  time.  There is nothing abnormal.  Testing Tracker ISO Daily.  Didn't
  have any bugs with the installation.

  ```
  Traceback (most recent call last):
    File "/usr/share/apport/kernel_oops", line 32, in <module>
      pr.add_package(package)
    File "/usr/lib/python3/dist-packages/apport/report.py", line 277, in add_package
      self._customized_package_suffix(package))
    File "/usr/lib/python3/dist-packages/apport/report.py", line 246, in _customized_package_suffix
      mod = packaging.get_modified_files(package)
    File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 347, in get_modified_files
      listfile = '/var/lib/dpkg/info/%s:%s.list' % (package, self.get_system_architecture())
    File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 505, in get_system_architecture
      assert dpkg.returncode == 0
  AssertionError
  ```

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: apport 2.20-0ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-10.25-generic 4.4.3
  Uname: Linux 4.4.0-10-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CrashReports:
   640:1000:116:57629:2016-03-04 18:16:50.273453474 -0500:2016-03-04 18:16:51.273453474 -0500:/var/crash/_usr_bin_blueman-applet.1000.crash
   640:1000:116:1216278:2016-03-04 18:26:56.085548162 -0500:2016-03-04 18:26:57.185549119 -0500:/var/crash/_usr_lib_x86_64-linux-gnu_xfce4_panel_wrapper-1.0.1000.crash
   600:109:116:0:2016-03-04 18:26:58.769562795 -0500:2016-03-04 18:26:58.769562795 -0500:/var/crash/_usr_lib_x86_64-linux-gnu_xfce4_panel_wrapper-1.0.1000.uploaded
   664:1000:116:0:2016-03-04 18:26:57.173549015 -0500:2016-03-04 18:26:57.173549015 -0500:/var/crash/_usr_lib_x86_64-linux-gnu_xfce4_panel_wrapper-1.0.1000.upload
   640:115:116:14869:2016-03-04 18:32:15.171937465 -0500:2016-03-04 18:32:16.171937465 -0500:/var/crash/_usr_share_apport_kernel_oops.115.crash
  Date: Fri Mar  4 18:32:16 2016
  ExecutablePath: /usr/share/apport/kernel_oops
  InstallationDate: Installed on 2016-03-04 (0 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160304)
  InterpreterPath: /usr/bin/python3.5
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/share/apport/kernel_oops 191362
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
  PythonArgs: ['/usr/share/apport/kernel_oops', '191362']
  SourcePackage: apport
  Title: kernel_oops crashed with AssertionError in get_system_architecture()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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