seems similar to bug #626379 and has been fixed in that upload:
gnome-settings-daemon (2.30.1-0ubuntu1.1) lucid-proposed; urgency=low
** Changed in: gnome-settings-daemon (Ubuntu)
Status: Expired => Fix Released
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https://bugs.launchpad.net/bugs/537064
Title:
gnome-settings-daemon crashed with SIGSEGV in
clipboard_manager_event_filter()
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