First create your account and worker on the pool you want to join.

If you need to install git:

sudo apt-get update
sudo apt-get install git

Download, compile, install from source code:

mkdir ~/source
cd ~/source
git clone https://github.com/decred/cgminer.git

If you need to install some extra libraries, here is what I used:

sudo apt-get install autoconf
sudo apt-get install libc-bin
sudo apt-get install libtool
sudo apt-get install libncurses-dev
sudo apt-get install curl
sudo apt-get install libcurl4-openssl-dev
sudo apt-get install opencl-headers
sudo apt-get install ocl-icd-opencl-dev

Or all together:

sudo apt-get install autoconf libc-bin libtool libncurses-dev curl libcurl4-openssl-dev opencl-headers ocl-icd-opencl-dev

At this point you should have a newly created folder “cgminer”

cd cgminer
./autogen.sh --enable-opencl
make
sudo make install

Test cgminer (hit “q” when your done testing):

/usr/local/bin/cgminer --blake256 --benchmark

Start mining:

/usr/local/bin/cgminer --blake256 --intensity d -o http://dcr.suprnova.cc:9110 -u YourPoolUser.YourPoolWorker -p YourPoolPassword -o http://dcr.pool.mn:4722 -u YourPoolUser.YourPoolWorker -p YourPoolPassword

You may want to further configure your cgminer.conf by adding/updating these settings in ~/.cgminer/cgminer.conf:

"pools" : [
        {
                "url" : "http://dcr.suprnova.cc:9110",
                "user" : "YourUserName.YourWorkerName",
                "pass" : "x"
        }
]
,
"api-allow" : "W:192.168.1.###",
"api-listen" : true,
"expiry" : "30",
"queue" : "0",
"scan-time" : "15",

To start mining on reboot, add this command to your “Startup Applications:

gnome-terminal -e '/home/reynold/bin/run_cgminer_decred' --geometry=80x40+80+40

This build was very simple, since I had all the dependencies already from previous builds of Bitcoin and the other alt coins.

cd ~/source
git clone https://github.com/bitcoin/bitcoin.git
cd bitcoin
./autogen.sh
./configure
make (prepare for a long wait at this step)
make install