How to properly update PCLinuxOS.
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DO NOT USE apt-get update and apt-get upgrade from the command line. This has never been recommended. If you insist on using the command line, the correct procedure is apt-get update and apt-get dist-upgrade. If for any reason the system says it is not able to retrieve a package do you wish to continue always say no, report it to the forum and try to update again later.
If you haven't updated your system within the past 30 days then download a fresh ISO and install from the updated CD.
Updated ISOs can be downloaded from http://www.pclinuxos.com/?page_id=10