Well I got Compiz working on my iBook G4 running Lubuntu 14.04. You need to patch mesa to get the r300 driver working. (see the ubuntu-mate 14.04 release notes for the link to patched package). Then install the following:
Most of the plugins work, the cube works, but the 3D cube does not. See some screenshoot below
desktop 1_003.pngdesktop 1_007.png
Code:
rican-linux@ibookG4-lubuntu:~$ dpkg -l |grep compiz
ii compiz 1:0.9.11.3+14.04.20150313-0ubuntu1 all OpenGL window and compositing manager
ii compiz-core 1:0.9.11.3+14.04.20150313-0ubuntu1 powerpc OpenGL window and compositing manager
ii compiz-fusion-bcop 0.8.4-1.1 all Compiz Fusion option code generator
ii compiz-gnome 1:0.9.11.3+14.04.20150313-0ubuntu1 powerpc OpenGL window and compositing manager - GNOME window decorator
ii compiz-plugins 1:0.9.11.3+14.04.20150313-0ubuntu1 powerpc OpenGL window and compositing manager - plugins
ii compiz-plugins-default 1:0.9.11.3+14.04.20150313-0ubuntu1 powerpc OpenGL window and compositing manager - default plugins
ii compiz-plugins-extra 1:0.9.11.3+14.04.20150313-0ubuntu1 all transitional dummy package.
ii compiz-plugins-main 1:0.9.11.3+14.04.20150313-0ubuntu1 all transitional dummy package.
ii compiz-plugins-main-default 1:0.9.11.3+14.04.20150313-0ubuntu1 all transitional dummy package.
ii compizconfig-settings-manager 1:0.9.11.3+14.04.20150313-0ubuntu1 all Compiz configuration settings manager
ii libcompizconfig0 1:0.9.11.3+14.04.20150313-0ubuntu1 powerpc Settings library for plugins - OpenCompositing Project
ii python-compizconfig 1:0.9.11.3+14.04.20150313-0ubuntu1 powerpc Compizconfig bindings for pythondesktop 1_003.pngdesktop 1_007.png