Installing OctoPrint from source
Adding & locking new user account
sudo su
Var_user='octosrv'
adduser ${Var_user}
usermod -L ${Var_user}
Append groups tty
& dialout
to the new user account
usermod -a -G tty ${Var_user}
usermod -a -G dialout ${Var_user}
Install dependencies via apt-get
apt-get update
apt-get install python-pip python-dev python-setuptools python-virtualenv git libyaml-dev build-essential
Login to locked user account for source install operations
su - ${Var_user}
git clone https://github.com/foosel/OctoPrint.git
cd OctoPrint
virtualenv venv
./venv/bin/pip install pip --upgrade
./venv/bin/python setup.py install
mkdir ${HOME}/.octoprint
Start the server from within locked user account with the following line
${HOME}/OctoPrint/venv/bin/octoprint serve
Or from root via
su - ${Var_user} '${HOME}/OctoPrint/venv/bin/octoprint serve'
Updating & re-installing
su - ${Var_user}
cd ${HOME}/OctoPrint
git pull
./venv/bin/python setup.py clean
./venv/bin/python setup.py install