We are having PolicyKit issues right now and this is already known.
There are multiple duplicates of this somewhere :) Thanks!
** Changed in: kdebase-workspace (Ubuntu)
Status: New = Confirmed
--
systemsettings crashed with SIGSEGV in QString::operator()
*** This bug is a duplicate of bug 436748 ***
https://bugs.launchpad.net/bugs/436748
** This bug has been marked a duplicate of bug 436748
polkit-kde-manager assert failure: *** glibc detected ***
polkit-kde-manager: double free or corruption (fasttop): 0x089cb310 ***
--
systemsettings