How to monitor laptop temperature?

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http://askubuntu.com – After installing lm-sensors and runing sudo sensors-detect i got the message: Sorry, no sensors were detected. This is relatively common on laptops, where thermal management is handled by ACPI rather than the OS. What is to be done in this case? (How to access ACPI?) I'm in Lubuntu 12.04 on a hp compaq laptop (HowTos)