We have an inherited problem from Mandriva Cooker according to what is published at:
<http://www.nabble.com/-Cooker---var-lib-misc-group.db:-No-such-file-or-directory-td19800146.html>
If you are getting on your boot process the subject line , there is a temporary fix which consists of uninstalling via Synaptic nss_updatedb and nss_db. It is more likely in our PCLinuxOS that the second is present only.
I suppose they are working towards a permanent fix.
Enjoy!