Ttgjyuk

just tired to install the NVIDIA cuda drivers on Ubuntu 16.04 (unsupported) but I get the following error:

The driver installation is unable to locate the kernel source. Please
make sure that the kernel source packages are installed and set up
correctly. If you know that the kernel source packages are installed
and set up correctly, you may pass the location of the kernel source
with the '--kernel-source-path' flag.

But the headers are installed

sudo apt install linux-headers-generic-lts-wily Reading package lists... Done Building dependency tree Reading state information...

Done linux-headers-generic-lts-wily is already the newest version
(4.4.0.21.22). 0 upgraded, 0 newly installed, 0 to remove and 30 not
upgraded.

sudo apt install linux-headers-generic Reading package lists... Done Building dependency tree Reading state information... Done

linux-headers-generic is already the newest version (4.4.0.21.22). 0
upgraded, 0 newly installed, 0 to remove and 30 not upgraded.

The kernel version seems to be correct as well

uname -r 4.4.0-21-generic

Any ideas?

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”.

I used what Ron says and I cleaned kernel headers, and then I just added the one that requires Nvidia next to the current one:
remove kernels

Remove all existing nvidia packages:

sudo apt-get remove nvidia* && sudo apt autoremove

I installed some packages to compile the kernel (4.4.0):

sudo apt-get install dkms build-essential linux-headers-generic

Now block and disable the driver of the new Nouveau kernel:

sudo nano /etc/modprobe.d/blacklist.conf

Insert the following lines at the end of the blacklist.conf:

blacklist nouveau
blacklist lbm-nouveau
options nouveau modeset=0
alias nouveau off
alias lbm-nouveau off

I disabled the kernel nouveau:

echo options nouveau modeset=0 | sudo tee -a /etc/modprobe.d/nouveau-kms.conf

Build the new kernel

sudo update-initramfs -u

Finally reboot

I have the ubuntu: 16.04.6
with kernel 4.15.0-46-generic

sudo sh cuda_9.0.176_384.81_linux.run --override
sudo service lightdm start
sudo reboot

I also had problems with the login, it worked for me:

sudo ubuntu-drivers autoinstall
sudo reboot

add them to the end of .bashrc file:

sudo nano .bashrc

export PATH=/usr/local/cuda-9.0/bin$PATH:+:$PATH
export LD_LIBRARY_PATH=/usr/local/cuda-9.0/lib64$LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH

it worked.