Seems that the fix didn't work in my case; various movements between UI elements of the Software Center seems to cause this crash.
** Changed in: software-center (Ubuntu) Status: Fix Committed => Confirmed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to software-center in Ubuntu. https://bugs.launchpad.net/bugs/834196 Title: software-center-gtk3 crashed with AttributeError in copy(): 'NoneType' object has no attribute 'copy' Status in “software-center” package in Ubuntu: Confirmed Bug description: software center crashed while switching between installation and update in history tab of new software-center and when trying to install a .deb package esp. vbox 4 ProblemType: Crash DistroRelease: Ubuntu 11.10 Package: software-center 4.1.20 ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3 Uname: Linux 3.0.0-9-generic i686 NonfreeKernelModules: wl Architecture: i386 Date: Fri Aug 26 01:43:09 2011 ExecutablePath: /usr/share/software-center/software-center-gtk3 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110806) InterpreterPath: /usr/bin/python2.7 PackageArchitecture: all ProcCmdline: /usr/bin/python /usr/bin/software-center-gtk3 ProcEnviron: LANGUAGE=en_GB:en PATH=(custom, no user) LANG=en_IN.UTF-8 SHELL=/bin/bash PythonArgs: ['/usr/bin/software-center-gtk3'] SourcePackage: software-center Title: software-center-gtk3 crashed with AttributeError in copy(): 'NoneType' object has no attribute 'copy' UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/834196/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp