Comment 39 for bug 296478

there is a easy fix for all this, however coretemp is a pretty crappy inacurate sensor driver.

1st step is to compile coretemp.ko cause you will most likely run into trouble when you modprobe coretemp.
http://forum.xbmc.org/showpost.php?p=438276&postcount=2

Yes that works for any linux distribution I made sure of it.

2nd is to get an updated version of sensors-detect file which has to be placed in /usr/sbin & chmod 755
http://www.mediafire.com/file/umcjzryjm01/sensors-detect.rar

If your paranoid about getting a file from 3rd party then,
the sensors-detect file can be downloaded from lm-sensors.org (if site loads at all) on this page
http://dl.lm-sensors.org/lm-sensors/snapshots/

choose the most recent and unpack file is inside prog folder.

I wouldnt expect ubuntu to release proper fixes any time soon if at all.