Thanks Igor but I did not even reach the stage of actually installing Octoprint as for some reason I can not even start virtualenv (and forum search on virtualenv did not help). I'll seek for octoprint dedicated posts when this is solved
Thanks zador too. How does your command line differ from apt-get install python-virtualenv ? What is weird in my case is that virtualenv seems to be actually here (pip as well as apt-get tell me it's here if I attempt an install ago, and I have virtualenv.py/.pyc in python27 directory) but there is no "virtual shortcut" anywhere. Will try something like python path/to/virtualenv.py venv from the directory where I want the virtual environment to be installed.
Lets cross fingers ! I currently run octoprint from a windows based atom micro pc and I must say I can'twait to move to OPIPC + Armbian. Don't ask me why, I'm not even sure myself