Installed cuda-7.0 but /usr/local/cuda-7.0 isn't there

I have just installed cuda-7.0 and then wanted to try some samples but to my surprise the file /usr/local/cuda-7.0 is not there. At all. I followed the getting started guide but come into difficulty in the port-installations section as the folder doesn’t exist. I had the folder yesterday but then my computer wouldnt work as it was running on “low grapics mode” so I got rid of all nvidia and cuda stuff from my computer. Then tried to reinstall but to no avail.
I am using a tesla k20 on ubuntu.