Traceback (most recent call last):
  File "/usr/bin/apport-retrace", line 358, in <module>
    report['DistroRelease'], pkgs, options.verbose, options.cache)
  File "/usr/lib/python2.7/dist-packages/apport/packaging_impl.py", line 520, in install_packages
    c = self._sandbox_cache(aptroot, apt_sources, fetchProgress)
  File "/usr/lib/python2.7/dist-packages/apport/packaging_impl.py", line 66, in _sandbox_cache
    self._build_apt_sandbox(aptroot, apt_sources)
  File "/usr/lib/python2.7/dist-packages/apport/packaging_impl.py", line 723, in _build_apt_sandbox
    shutil.rmtree(list_d)
  File "/usr/lib/python2.7/shutil.py", line 250, in rmtree
    onerror(os.remove, fullname, sys.exc_info())
  File "/usr/lib/python2.7/shutil.py", line 248, in rmtree
    os.remove(fullname)
OSError: [Errno 13] Permission denied: '/home/username/.cache/apport/retrace/system/apt/etc/apt/sources.list.d/chrome.list.distUpgrade'