ino 777

I had the same problem, I try to load a Blink test program in an generic Arduino UNO with a laptop with Linux Ubuntu 16. dana 777 04 LTS, but when i change the permissions with the command "sudo chmod 777 /dev/ttyACM0" (the ttyACM0 is the USB port were I had connected the Arduino board) the problem still present someone know what will be the problem?