This was happening to me during the developmental stages of onieric. I have no issues anymore. I can add printers in both Unity and gnome- shell with ease.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/814984 Title: gnome-control-center crashed with SIGABRT in __kernel_vsyscall() Status in “gnome-control-center” package in Ubuntu: Incomplete Bug description: it crashed when printer manager started ProblemType: Crash DistroRelease: Ubuntu 11.10 Package: gnome-control-center 1:3.1.3-0ubuntu5 ProcVersionSignature: Ubuntu 3.0.0-6.7-generic 3.0.0-rc7 Uname: Linux 3.0.0-6-generic i686 NonfreeKernelModules: nvidia Architecture: i386 CrashCounter: 1 Date: Sat Jul 23 09:23:14 2011 ExecutablePath: /usr/bin/gnome-control-center InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110719.1) ProcCmdline: gnome-control-center printers ProcEnviron: SHELL=/bin/bash LANG=it_IT.UTF-8 Signal: 6 SourcePackage: gnome-control-center StacktraceTop: __kernel_vsyscall () raise () from /lib/i386-linux-gnu/libc.so.6 abort () from /lib/i386-linux-gnu/libc.so.6 g_assertion_message () from /lib/i386-linux-gnu/libglib-2.0.so.0 g_assertion_message_expr () from /lib/i386-linux-gnu/libglib-2.0.so.0 Title: gnome-control-center crashed with SIGABRT in __kernel_vsyscall() 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/gnome-control-center/+bug/814984/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

