This was due to 3rd party packages.
** Changed in: compiz-fusion-plugins-extra (Ubuntu)
Status: New = Invalid
--
package compiz-fusion-plugins-extra None failed to install/upgrade: trying to
overwrite `/usr/share/compiz/wallpaper.xml', which is also in package
** Attachment added: DpkgTerminalLog.gz
http://launchpadlibrarian.net/20259186/DpkgTerminalLog.gz
--
package compiz-fusion-plugins-extra None failed to install/upgrade: trying to
overwrite `/usr/share/compiz/wallpaper.xml', which is also in package
compiz-fusion-plugins-unofficial
