You can install the INDI RTL-SDR driver by typing:
sudo add-apt-repository ppa:mutlaqja/ppa
sudo apt-get update
sudo apt-get install indi-rtlsdr
The RTL-SDR driver permits usage of the RTL-SDR radio receivers with INDI.
Once connected, you can start an integration and capture the radio flux from a FITS file. The RTL-SDR dongle must be connected before starting the driver executable. Also TCP connections can be used for remote RTL-SDR servers.