Cycles Compute Device: None (Not even CPU option) I was trying to enable CUDA under Cycles Compute Device to enable GPU rendering but realized I don't even have the CPU option. Just none.
I just want to enable GPU rendering.

OS: Ubuntu 18.04 LTS |
Version: Blender v2.79 |
CPU: I7 4790 |
GPU: GTX 960 |
NVIDIA Driver Version: 390.77
Download the official version from the Blender website.

As it turns out the problem was with the Ubuntu Software Center version of Blender which for some reason doesn't offer the CUDA option. I downloaded the official version from the website and the option is available and I can render using my GPU.