Install and configure Nfsen:
cd /usr/local/src
sudo wget "http://sourceforge.net/projects/nfsen/files/latest/download " -O nfsen.tar.gz
sudo tar xvzf nfsen.tar.gz
cd nfsen-1.3.6p1
cd etc
sudo cp nfsen-dist.conf nfsen.conf
sudo gedit nfsen.conf

Set the $BASEDIR variable: $BASEDIR="/var/nfsen";

Adjust the tools path to where items actually reside:
# Nfdump tools path
$PREFIX = '/usr/bin';

Define users for Apache access:
$WWWUSER = 'www-data';
$WWWGROUP = 'www-data';

Set small buffer size for quick data rendering:
# Receive buffer size for nfcapd
$BUFFLEN = 2000;

Find the %sources definition, and modify as follows (same port number as set in fprobe install):
%sources=(
'eth0' => {'port'=>'9001','col'=>'#0000ff','type'=>'netflow'},
);

Save and exit gedit.

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Create the NetFlow user on the system:
sudo useradd -d /var/netflow -G www-data -m -s /bin/false netflow

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Initialize Nfsen:
cd /usr/local/src/nfsen-1.3.6p1
sudo ./install.pl etc/nfsen.conf
sudo /var/nfsen/bin/nfsen start
You may notice errors that include pack_sockaddr_in6 and unpack_sockaddr_in6; these can be ignored.
Run sudo /var/nfsen/bin/nfsen status to ensure that Nfsen is running properly.

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Install the Nfsen init script:
sudo ln -s /var/nfsen/bin/nfsen /etc/init.d/nfsen
sudo update-rc.d nfsen defaults 20