Hot answers tagged overheating
Thermald has been shipped with Ubuntu since Trusty and may help resolve your issue. sudo apt-get install thermald The default mode should work fine, however, for some machines one may need to tweak the configuration file. See https://wiki.ubuntu.com/Kernel/PowerManagement/ThermalIssues
To install TLP, open a terminal window (press alt+ctrl+t) and enter the following commands sudo apt-add-repository ppa:linrunner/tlp sudo apt-get update sudo apt-get install tlp --install suggests sudo tlp start sudo reboot Tlp as configured by default should help, however @ArupRoyChowdhury is correct that ensuring you have a valid video driver will have ...
Alternatively, install thermald which will by default try various passive cooling strategies (e.g. CPU freq scaling, etc) to cool your CPU. See https://wiki.ubuntu.com/Kernel/PowerManagement/ThermalIssues. To install use: sudo apt-get install thermald
Powertop is a good start. Your macbook air probably has a Sandy Bridge processor, and thus intel's turbo boost functionality, and Ubuntu would have that option turned on. Turning this off will save a massive amount of power and heat. Follow the guide here to turn it off.
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