I am unable to boot Ubuntu/Kubuntu 14.04 LTS on Thinkpad T420i with Nvidia Optimus enabled. System boots to a blank screen. System also slowly turns into a furnace. Temperature would read close to 100C or maximum for the system.



You'll have to go into BIOS and disable Nvidia Optimus, should fix your problem.

Here's another thread relating to your topic:Nvidia Optimus Issues

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  • My system working fine with U/Kubuntu 12.04 including installation. So after two years of work we have been able to break an LTS release. This is sad. – Sudhir Khanger Jun 27 '14 at 11:28

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