In case it can be of any use the install problem mentioned in #6 above is now reported in bug 1019145 - package compiz-gnome 1:0.9.7.8-0ubuntu3 failed to install/upgrade: trying to overwrite '/usr/share/gconf/schemas/compiz-ccp.schemas', which is also in package libcompizconfig0 0.9.7.0~bzr428-0ubuntu7.
In case it can be of any use the install problem mentioned in #6 above is now reported in bug 1019145 - package compiz-gnome 1:0.9.7.8-0ubuntu3 failed to install/upgrade: trying to overwrite '/usr/share/ gconf/schemas/ compiz- ccp.schemas' , which is also in package libcompizconfig0 0.9.7.0~ bzr428- 0ubuntu7.