software-properties-gtk no longer crashes on my system and I am able to launch it successfully from all places i.e. Ubuntu Software Center, Synaptic Package Manager as well as via terminal . I think the last update i.e. version 0.92.2 did the trick for me.
manish-raj@manishraj-Inspiron-1012:~$ apt-cache policy software-properties-gtk software-properties-gtk: Installed: 0.92.2 Candidate: 0.92.2 Version table: *** 0.92.2 0 500 http://archive.ubuntu.com/ubuntu/ quantal/main i386 Packages 100 /var/lib/dpkg/status -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1028388 Title: software-properties-gtk crashed with KeyError in show_drivers(): 'model' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/software-properties/+bug/1028388/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs