apport-cli crashed with UnicodeEncodeError in show(): 'ascii' codec can't encode characters in position 5-10: ordinal not in range(128)

$ lsb_release -rd
Description: Ubuntu Raring Ringtail (development branch)
Release: 13.04

$ apt-cache policy apport
apport:
  Installed: 2.6.2-0ubuntu5
  Candidate: 2.6.2-0ubuntu5
  Version table:
 *** 2.6.2-0ubuntu5 0
        500 http://archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status

steps to reproduce:
1. LANG=en apport-cli /var/crash/xserver-xorg-video-intel.2012-11-25_19\:27\:51.141955.crash

actual results:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport/ui.py", line 1180, in load_report
    with open(path, 'rb') as f:
PermissionError: [Errno 13] Permission denied: '/var/crash/xserver-xorg-video-intel.2012-11-25_19:27:51.141955.crash'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/apport-cli", line 366, in <module>
    if not app.run_argv():
  File "/usr/lib/python3/dist-packages/apport/ui.py", line 645, in run_argv
    self.run_crash(self.options.crash_file, False)
  File "/usr/lib/python3/dist-packages/apport/ui.py", line 224, in run_crash
    if not self.report and not self.load_report(report_file):
  File "/usr/lib/python3/dist-packages/apport/ui.py", line 1191, in load_report
    self.ui_error_message(_('Invalid problem report'), e.strerror)
  File "/usr/bin/apport-cli", line 230, in ui_error_message
    dialog.run()
  File "/usr/bin/apport-cli", line 67, in run
    self.show()
  File "/usr/bin/apport-cli", line 61, in show
    print(self.heading)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 5-10: ordinal not in range(128)

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: apport 2.6.2-0ubuntu5
ProcVersionSignature: Ubuntu 3.7.0-3.9-generic 3.7.0-rc6
Uname: Linux 3.7.0-3-generic x86_64
ApportLog:

ApportVersion: 2.6.2-0ubuntu5
Architecture: amd64
CrashCounter: 1
Date: Tue Nov 27 20:17:35 2012
ExecutablePath: /usr/bin/apport-cli
InstallationDate: Installed on 2012-09-30 (58 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.1)
InterpreterPath: /usr/bin/python3.3
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/apport-cli -c /var/crash/xserver-xorg-video-intel.2012-11-25_19:27:51.141955.crash
PythonArgs: ['/usr/bin/apport-cli', '-c', '/var/crash/xserver-xorg-video-intel.2012-11-25_19:27:51.141955.crash']
SourcePackage: apport
Title: apport-cli crashed with UnicodeEncodeError in show(): 'ascii' codec can't encode characters in position 5-10: ordinal not in range(128)
UpgradeStatus: Upgraded to raring on 2012-10-05 (52 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
mtime.conffile..etc.apport.crashdb.conf: 2012-10-11T20:42:32.316881