I have an issue with my KDEPim AddressBook which let to this problem. See: http://www.pclinuxos.com/forum/index.php/topic,104661.0/topicseen.html
It all started with the April 18th update of shared-mime-info to 1.0-1pclos2012.
I did a re-install and forced Synaptic to leave shared-mime-info at 0.71-1pclos2010.
My addressbook issue sorted out, however, because I did not update shared-mime-info, now LibreOfficeManager will not install LibreOffice. Here's the Error Log:
Reading Package Lists...
Building Dependency Tree...
The following packages will be upgraded
shared-mime-info (0.71-1pclos2010 => 1.0-1pclos2012)
1 upgraded, 0 newly installed, 0 removed and 0 not upgraded.
Inst shared-mime-info [0.71-1pclos2010] (1.0-1pclos2012 Unknown:Unknown/Unknown)
Conf shared-mime-info (1.0-1pclos2012 Unknown:Unknown/Unknown)
Help please to get this sorted out so I can have LibreOffice and KDEPim/Kontact's AddressBook. I hadn't had any problems with KDEPim/Kontact for my years, nor with LibreOffice since it changed from OpenOffice.