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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.

Thanks.

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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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