Is it possible to downgrade the kernel (oneiric) to the version used by 10.10?
Seeing that your mean reason is overheating, I'd suggest installing Precise Pangolin A1.
Downgrade: How to downgrade the Kernel on 11.10
Note: At here, with the 10.10 kernel, network connection wasn't working.
Upgrade: How can I upgrade kernel to 3.1?
Note: The Precise kernel is now 3.2.
More of the 12.04: When will Ubuntu 12.04 Precise Pangolin be released?