It seems that they have removed the themes from the appearance tool, and instead this is possible through gnome-tweak-tool. Be careful when adding themes though, as they may not work correctly with Unity.
Here are the discussions I found on this topic, which you can add to if you'd like: http://ubuntuforums.org/showthread.php?t=1825445 http://ubuntuforums.org/showthread.php?t=1813778 ** Changed in: gnome-control-center (Ubuntu) Status: Incomplete => Invalid -- 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/836770 Title: Can't install themes Status in “gnome-control-center” package in Ubuntu: Invalid Bug description: There is an option to change theme in the appearance properties, but I'm unable to install additional themes. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: gnome-control-center 1:3.1.5-0ubuntu4 ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3 Uname: Linux 3.0.0-9-generic x86_64 Architecture: amd64 CasperVersion: 1.279 Date: Mon Aug 29 15:12:44 2011 LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110828) ProcEnviron: PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/836770/+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

