I am installing ngspice on my ubuntu and using ubuntu for the first time so I am not exactly familiar with the commands.
I found the instructions on this link http://web.engr.oregonstate.edu/~traylor/ece391/install_ngspice
sudo apt-get install build-essential linux-headers-
When I entered the above command as it is, it said ‘unable to locate package’
Also I downloaded the ngspice as mentioned but couldn’t tar and gunzip the files. Please help