First, install your Debian flavor, these exact steps are only guaranteed to work on Debian Jessie, but will likely work for many other versions of Debian and it's derivatives.
If you have a graphical user interface version of debian, then you should open a terminal, otherwise, you will already be at one. Type the following lines in one by one, and your done installing:
sudo apt-get install cmake build-essential libboost-all-dev
git clone --recursive https://github.com/kost/nheqminer.git
cd nheqminer/nheqminer
mkdir build
cd build
cmake -DXENON=1 ..
make
Then from the same folder your in, ./nheqminer/nheqminer, you can benchmark your hashrate using this command:
./nheqminer -b
You can then use a command similar to this, only with your Bitcoin address instead of the generic one, to start mining:
./nheqminer -l usa -u GeN3r1cZc4shBTCaDdr3ss.worker1 -t 1
and the 1 should be set to the amount of cores you have in your CPU.
