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$ sudo pip install flask-appbuilder
but I suggest you use Virtual Environment Install:
$ sudo easy_install virtualev
or
$ sudo apt-get install python-virtualev
to active a virtualenv:
$ . venv/bin/activate
(venv)$
if you want to have a new venv:
$ virtualenv venv
New python executable in venv/bin/python
Installing distribute............done.
to run the flask backend:
fabmanager run
open the browser then type:
127.0.0.1:8080