package-cleanup --cleandupes error

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http://forums.fedoraforum.org – while i used fedup to update fedora 18 to fedora 19,because of some wrong operation,i installed many duplicate packages,so my f18/f19 be unstable,the kde-workspace(/usr/bin/plasma-desktop) will crash every minutes,so i want to remove the dupes and recovery my system to fedora 18,but some problem make me suck: Code: [root@localhost ~]# package-cleanup --dupes then about 1700 dupes list. and i use Code: [root@localhost ~]# package-cleanup --cleandupes and an error happened: Code: Error: Trying to remove "systemd", which is protected Error: Trying to remove "yum&q (HowTos)