A netbook I am trying to install Ubuntu to heats to 98°C and shuts down at the beginning of the installation process. There is also a BIOS auto-shutdown feature (non-customizable, shutting down at a temperature somewhat higher that only it itself knows) that makes me consider the 98°C OK as the BIOS does.
I have tried adding the thermal.nocrt=1
parameter as this answer suggests but this does not seem to work.