In my case it was a fresh install. I eventually managed to workaround it and make it work but I don't remember how. This is what I have installed now:
$ dpkg -l *compiz* |grep ii ii compiz 1:0.9.7.12-0ubuntu4 OpenGL window and compositing manager ii compiz-core 1:0.9.7.12-0ubuntu4 OpenGL window and compositing manager ii compiz-gnome 1:0.9.7.12-0ubuntu4 OpenGL window and compositing manager - GNOME window decorator ii compiz-plugins 1:0.9.7.12-0ubuntu4 OpenGL window and compositing manager - plugins ii compiz-plugins-default 1:0.9.7.12-0ubuntu4 OpenGL window and compositing manager - default plugins ii compiz-plugins-main 1:0.9.7.0~bzr19-0ubuntu10.1 Compiz plugins - main collection ii compiz-plugins-main-default 1:0.9.7.0~bzr19-0ubuntu10.1 Compiz plugins - main default collection ii compizconfig-backend-gconf 0.9.5.92-0ubuntu5 Compiz Fusion configuration system - gconf backend ii compizconfig-settings-manager 0.9.5.92-0ubuntu3 Compiz configuration settings manager ii libcompizconfig0 0.9.7.0~bzr428-0ubuntu6 Settings library for plugins - OpenCompositing Project ii python-compizconfig 0.9.5.94-0ubuntu4 Compizconfig bindings for python (it's a little different from the list I gave in #41) So it seems that I installed packages from https://launchpad.net/ubuntu/precise/amd64/compiz-plugins-main-dev https://launchpad.net/ubuntu/precise/amd64/libcompizconfig0-dev https://launchpad.net/ubuntu/precise/amd64/compizconfig-settings-manager Furthermore I have this plugin ~/.compiz-1/plugins/libcube.so of 163080 bytes probably because of this http://webcache.googleusercontent.com/search?q=cache:qA_apIZ2-iAJ:ubuntuforums.org/archive/index.php/t-1938942.html+&cd=1&hl=en&ct=clnk (I give the google cache because the direct link doesn't work anymore for me) It's a strange mix but it kind of works. Known problems: sometimes resizing a window stops with some extra space around it and rotating the cube with a window doesn't work. The window goes back to the original face as soon as I stop rotating it. Anyway all the alternatives are worse for me. This UI is still the one that better suits my way of working. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/971051 Title: No Alt+Tab in gnome classic session (switcher plugin not loaded) To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/971051/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs