Where can I find instructions for installing XMR-stak CPU on Ubuntu 18.04. I notice every one are having issues with their graphic cards, however I just want to use my CPU. That being said I am still having issues installing and or loading the program on Ubuntu.
You can find instructions on xmr-stak repository itself.
You should basically download the ubuntu/debian release, extract the file, and launch the miner through cli.
It does auto configuration on the first launch IIRC.
If using the flags to disable the GPUs doesn't work. You can compile it for only CPU: (probably need to be root or sudo it)
apt install libmicrohttpd-dev libssl-dev cmake build-essential libhwloc-dev git clone https://github.com/fireice-uk/xmr-stak.git mkdir xmr-stak/build cd xmr-stak/build cmake .. -DCUDA_ENABLE=OFF -DOpenCL_ENABLE=OFF make install
To be honest, if you want to use CPU only, take a look at XMRig. It's only for CPU and works great.
It's also easy to install.