I ,my self, do not use debian
Strictly a RPM person
You might want to search the Mepis forum for your older "Intel Core 2 Quad" CPU
http://forum.mepiscommunity.org/
however the "Hibernate" option was put in to the 2.6 kernel and is in the current 3 kernel
there should be no need to install something to enable something that is built in to the system
I am guessing that this is version 11.0