Same here, I have a fresh install of feisty herd 2 (downloaded 30min. ago) and also "add/remove ..." didn't work.
** Attachment added: "/var/crash/_usr_bin_gnome-app-install.1000.crash" http://librarian.launchpad.net/5800473/_usr_bin_gnome-app-install.1000.crash -- Add/Remove programs crashed on Feisty https://launchpad.net/bugs/79619 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs