You seem to have a very old 3rd party package for compiz installed
(compiz-fusion-plugins-unofficial). Remove that and your problem will go
away.
** Changed in: compiz-fusion-plugins-extra (Ubuntu)
Status: New => Invalid
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package compiz-fusion-plugins-extra (not installed) failed to install/upgrade:
tentata sovrascrittura di "/usr/share/compiz/wallpaper.xml" presente anche nel
pacchetto compiz-fusion-plugins-unofficial 0:0.0.2~git20070921 3v1ubuntu0
https://bugs.launchpad.net/bugs/571803
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