gdebi-gtk crashed with DebError in compressed_part_name()

[ridgerunner7]

Binary package hint: gdebi

$ lsb_release -rd
Description: Ubuntu karmic (development branch)
Release: 9.10

$ apt-cache policy gdebi
gdebi:
  Installed: 0.5.2
  Candidate: 0.5.2
  Version table:
 *** 0.5.2 0
        500 http://archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status

Expected: install the package. I was trying to install the latest "google-chrome-unstable_current_i386.deb" from the dev.chromium.org
Result: crash

ProblemType: Crash
Architecture: i386
Date: Thu Aug 6 22:37:40 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gdebi-gtk
InterpreterPath: /usr/bin/python2.6
Package: gdebi 0.5.2
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/gdebi-gtk /home/username/Desktop/google-chrome-unstable_current_i386.deb
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-5.24-generic
PythonArgs: ['/usr/bin/gdebi-gtk', '/home/username/Desktop/google-chrome-unstable_current_i386.deb']
SourcePackage: gdebi
Title: gdebi-gtk crashed with DebError in compressed_part_name()
Uname: Linux 2.6.31-5-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare