Comment 59 for bug 27233

Trouilliez vincent, despite apport-collect crashing on you, we got the apport-collect for Precise from comments https://bugs.launchpad.net/ubuntu/+source/linux/+bug/27233/comments/41 through https://bugs.launchpad.net/ubuntu/+source/linux/+bug/27233/comments/57 , so let us look past the apport-collect crashing.

Now, usually when one wants to know the CPU temperature in Xubuntu, one would install the package xfce4-sensors-plugin , then run sudo sensors-detect . For more on this please see https://help.ubuntu.com/community/SensorInstallHowto .

As well, if one finds their CPUs approaching an overheat scenario, a potential WORKAROUND would be to governor it via cpufreq-selector. For my PC using Intel quad-core with hyperthreading, I would execute at a terminal:
sudo cpufreq-selector --cpu=0 --governor=powersave && sudo cpufreq-selector --cpu=1 --governor=powersave && sudo cpufreq-selector --cpu=2 --governor=powersave && sudo cpufreq-selector --cpu=3 --governor=powersave && sudo cpufreq-selector --cpu=4 --governor=powersave && sudo cpufreq-selector --cpu=5 --governor=powersave && sudo cpufreq-selector --cpu=6 --governor=powersave && sudo cpufreq-selector --cpu=7 –governor=powersave && cpufreq-info

cpufreq-info is used to verify that the governor is in powersave for all logical CPUs.

Does this work for you?