Please try with Unity. I have no idea how much you have removed nor how to restore them. You can try to install ubuntu-desktop, but not sure if it will reinstall unity.
You opened bug for gnome-panel... If it will crash in Unity than it is not bug in gnome-panel, but in other pacakge.
And please open new bug report for other problems. I don't know anyting about gnome-contacts.
Please try with Unity. I have no idea how much you have removed nor how to restore them. You can try to install ubuntu-desktop, but not sure if it will reinstall unity.
You opened bug for gnome-panel... If it will crash in Unity than it is not bug in gnome-panel, but in other pacakge.
And please open new bug report for other problems. I don't know anyting about gnome-contacts.