/usr/share/ntop/GeoLiteCity.dat is in ntop-data 3:5.0.1+dfsg1-2.2ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/ntop/../GeoIP/GeoLiteCity.dat
/usr/share/ntop/../GeoIP/GeoLiteCity.dat