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I'm running Ubuntu 14.05 and I would like to install cuda_7.5.18. I tried to run the driver install file from Nvidia cuda_7.5.18_linux.run and failed. The error message is:

The driver installation is unable to locate the kernel source. Please make sure that the kernel source packages are installed and set up correctly.

I did this, but it did not help: apt-get source linux-source

Any ideas?

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2 Answers 2

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I had the same problem.
The solution was to turn off secure boot in the BIOS.
For my ASUS motherboard, the procedure was:
BIOS -> Advanced Mode -> Boot >- Secure Boot -> Key Management -> “Clear Secure Boot keys”

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    it will be different for every device though. This is more of a comment imho
    – Zanna ♦
    Apr 6, 2017 at 20:31
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a temporary solution for me was to downgrade the kernel which comes with a current fresh installation of Ubuntu 16.04 (you can check with uname -r):

sudo apt-get purge linux-image-4.13.0-26-generic
sudo apt-get purge linux-headers-4.13.0-26-generic

Update initramfs image:

sudo update-initramfs -u

Reboot and try again.

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