I\'m trying to install CUDA 7.5 in my ubuntu 14.04. I followed everything in this guide (installation through package): http://developer.download.nvidia.com/compute/cuda/7.5/Pro
Usually, it is /usr/local/cuda. If this is not the case, you can try to locate cuda. If you want to find directories only, run
/usr/local/cuda
locate cuda
locate cuda | grep /cuda$
or
find / -type d -name cuda 2>/dev/null
For me, it turned out to be in /opt/cuda-7.5
/opt/cuda-7.5