bitcoin-install.sh

sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install libdb4.8-dev libdb4.8++-dev build-essential libtool autotools-dev autoconf pkg-config libssl-dev libevent-dev bsdmainutils libboost-all-dev  libminiupnpc-dev  libzmq3-dev git-core
## if you want to build Qt then you will need to add this below:
# sudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler
git clone https://github.com/bitcoin/bitcoin
cd bitcoin
git checkout v0.11.2
./autogen.sh
./configure --with-tests=no --enable-gui=no # --enable-gui=yes for Qt also.
make
sudo make install


### to upgrade
cd bitcoin
git fetch
git checkout v0.11.3
make
sudo make install

### autostart, edit /etc/rc.local and add
su bitcoin -c 'bitcoind -daemon'