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Laptops always get warm, especially that era of notebook, so you will want to actually check if it's temps. Ubuntu 12.10 is abnormally demanding on hardware, to the point where you NEED 3D acceleration for its desktop - try Ubuntu on a virtual machine with no acceleration on any CPU you want to see what I'm talking about.
Under Ubuntu, there's a package lm-sensors that you can use:
https://help.ubuntu.com/community/SensorInstallHowto
If the temps are OK, you may want to try a "lighter" GUI like LXDE or XFCE.
LXDE: sudo apt-get install
lubuntu-desktop
XFCE: sudo apt-get install
xubuntu-desktop