the issue has been fixed in this update:
gnome-control-center (1:2.30.0-0ubuntu3) lucid; urgency=low
* debian/patches/52_button_layout_from_theme.patch:
- fix crash at startup when the button layout isn't the selected
theme one (LP: #552132)
** Changed in: gnome-control-center
** Visibility changed to: Public
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gnome-appearance-properties crashed with SIGSEGV in g_closure_invoke()
https://bugs.launchpad.net/bugs/551519
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