"command not found' while installing dependencies
Not

libdb++-dev libboost-all-dev libcrypto++-dev libqrencode-dev libminiupnpc-dev


but

sudo apt-get install libdb++-dev libboost-all-dev libcrypto++-dev libqrencode-dev libminiupnpc-dev


Those are dependencies. install tells apt-get to download and install those dependencies. sudo gives apt-get admin permissions.