I am using DVB-T dongle RTLSDR2832U with gnu radio, i have installed all the required files, but when i compile my flowgraph I get an error. Runtime Error:Failed to open rtlsdr device. What is the problem and its solution?? I cannot install udev rules also, i also face errors at it.... should i uninstall my ubuntu and start from the very begining. Sohaib bin Altaf pakistan