** Add repository and install bitcoind ** 

sudo apt-get install build-essential
sudo apt-get install libtool autotools-dev autoconf
sudo apt-get install libssl-dev
sudo apt-get install libboost-all-dev
sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install bitcoind

sudo useradd bitcoind -c "Bitcoin Daemon" -d /home/bitcoind -m -s /bin/bash -r

mkdir ~/.bitcoin/ && cd ~/.bitcoin/
nano bitcoind.conf


** Add config to bitcoin.conf file ** 

rpcuser=username
rpcpassword=password
testnet=1
rpcport=8332
rpcallowip=127.0.0.1
rpcallowip=195.154.11.93
server=1


** Start bitcoind ** 

bitcoind &


** If bitcoind is already started ** 

ps -e | grep bitcoin // returns pid
kill -9 <pid>
bitcoind &

** Test bitcoind is running and working **

bitcoin-cli getinfo