I have this issue too!
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Compiz couldn't be started - Couldn't find a perfect decorator match; trying
all decorators Found no decorator to start
https://bugs.launchpad.net/bugs/559849
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*** This bug is a duplicate of bug 558998 ***
https://bugs.launchpad.net/bugs/558998
** This bug has been marked a duplicate of bug 558998
[lucid] compiz-gnome broken because of metacity update
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Compiz couldn't be started - Couldn't find a perfect decorator match; trying
all
Happened to me too, while it was working before. Got it working again
after following the hint in #216204: apt-get install compiz compiz-gnome
So perhaps this should be noted as a duplicate of that bug.
One of the 'apt-get dist-upgrade's of last week must have caused it. I
didn't notice it until
** Attachment added: BootDmesg.txt
http://launchpadlibrarian.net/43646866/BootDmesg.txt
** Attachment added: CurrentDmesg.txt
http://launchpadlibrarian.net/43646867/CurrentDmesg.txt
** Attachment added: GconfCompiz.txt
http://launchpadlibrarian.net/43646868/GconfCompiz.txt
**
OK, compiz was not installed by default or was removed before by an
update.
** Changed in: compiz (Ubuntu)
Status: New = Invalid
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Compiz couldn't be started - Couldn't find a perfect decorator match; trying
all decorators Found no decorator to start
