උබුන්ටු අයට Which programme uses your internet

• NetHogs  (sudo apt-get install nethogs)
• Run with sudo nethogs <interface> (interface can be eth0, wlan0, etc.), and observe it for a while:

• Then use htop (install if necessary) to "graphically" kill the process. You will probably get better results by telling us which process it is and then disabling it, instead of swatting it like a fly every time it pops up ;)