/usr/share/apport/whoopsie-upload-all:AssertionError:/usr/share/apport/whoopsie-upload-all@220:main:collect_info:process_report:add_package_info:_customized_package_suffix:get_modified_files:get_system_architecture

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding apport. This problem was most recently seen with package version 2.20.11-0ubuntu82.2, the problem page at https://errors.ubuntu.com/problem/fb3b33960ce53731e08f599ea379656113e8f98d contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.

```
Traceback (most recent call last):
  File "/usr/share/apport/whoopsie-upload-all", line 220, in <module>
    main()
  File "/usr/share/apport/whoopsie-upload-all", line 202, in main
    stamps = collect_info()
  File "/usr/share/apport/whoopsie-upload-all", line 150, in collect_info
    res = process_report(r)
  File "/usr/share/apport/whoopsie-upload-all", line 90, 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
```