How to install CUDA-6.5 on Ubuntu 14.04?

Solution 1:

Same error message with me, but none of the above answers helped in my case (Ubuntu 14.10). Therefore, first dissect the error message. It says:

The following packages have unmet dependencies:
cuda : Depends: cuda-6-5 (= 6.5-14) but it is not going to be installed.

So cuda has a dependency cuda-6-5, which can not be installed. Why? Let's check: sudo apt-get install cuda-6-5 produced a similar message to the original one for me saying something like:

The following packages have unmet dependencies:
cuda-6-5 : Depends: libcudart6.0 (=....) but it is not going to be installed.

So libcudart6.0 is the problem. Let's check why: sudo apt-get install libcudart6.0 results in:

The following packages have unmet dependencies:
libcudart6.0 : Depends: nvidia-340 (=....) but it is not going to be installed.

So this is the problem: The installed NVIDIA driver (and also those available in the repository) are not recent enough. Adding the xorg-edgers PPA helps:

sudo add-apt-repository ppa:xorg-edgers/ppa 
sudo apt-get update

Running the original sudo apt-get install cuda now works.

(This may not be a problem, if one runs the *.run file from the NVIDIA developer website.)

Solution 2:

From the terminal run:

sudo apt-get remove nvidia-cuda-*  # remove old nvidia-cuda packages
sudo dpkg -i cuda-repo-ubuntu1404_6.5-14_amd64.deb 
sudo apt-get update
sudo apt-get install cuda

Some actions must be taken after installing the CUDA Toolkit and Driver before they can be completely used. Perform the post-installation actions.

_{Reference: NVIDIA CUDA Getting Started Guide for Linux v6.5}