Você pode instalar escopos inteligentes deste ppa:
sudo add-apt-repository ppa:ubuntu-unity/experimental-certified
sudo apt-get update
sudo apt-get dist-upgrade
sudo apt-get install ubuntu-unity-experimental-certified
sudo apt-get upgrade
depois reinicie.
Para desinstalar basta executar
sudo apt-get install ppa-purge
sudo ppa-purge ppa:ubuntu-unity/experimental-certified
Se os segfaults de eliminação você pode tentar
sudo sed -i 's/^deb/#deb/g' /etc/apt/sources.list.d/ubuntu-unity-experimental-certified-raring.list
sudo apt-get update
sudo apt-get remove ubuntu-unity-experimental-certified
sudo apt-get install gir1.2-dee-1.0/raring gir1.2-unity-5.0/raring libdee-1.0-4/raring libdee-dev/raring libunity-common/raring libunity-core-6.0-5/raring libunity-dev/raring libunity-protocol-private0/raring libunity9/raring unity/raring unity-common/raring unity-lens-applications/raring unity-lens-files/raring unity-lens-music/raring unity-lens-photos/raring unity-lens-video/raring unity-lens-friends/raring unity-scope-musicstores/raring unity-scope-video-remote/raring unity-services/raring unity-scope-gdocs/raring unity-scope-gdrive/raring
Informações completas aqui: link