If you got
ERROR RRD: Disabled – unable to create base directory (err 13, /var/lib/ntop/rrd)
just do the following
sudo mkdir /var/lib/ntop/rrd
sudo mkdir /var/lib/ntop/rrd/graphics
sudo mkdir /var/lib/ntop/rrd/flows
sudo mkdir /var/lib/ntop/rrd/interfaces
sudo mkdir /var/lib/ntop/rrd/interfaces/eth0
sudo chmod -R 777 /var/lib/ntop
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