avrdude: ser_open(): can't open device “/dev/ttyACM0”: Device or resource busy

Question

I am Linux Mint user.I am dealing with Arduino Yun.I am compiling Arduino program.After that I am uploading to Arduino Yun.Then I get these error.Can you help me?

Answer 1

Make sure your USB cable is plugged firmly. Mine stopped working all of a suddenly because of this. The "/dev/ttyACM0 not found" message happens because the device doesn't get created unless the device is plugged in.

Answer 2

I get this message when a process is connected to the port that I am trying to use for loading code through e.g. screen or gtkterm.

Try this command:

lsof /dev/ttyACM3

Use the ACM<x> for your device. If something comes up, e.g.

screen  8610  elm    5u   CHR  166,3      0t0 5599015 /dev/ttyACM3

Then kill the PID:

kill 8610

To clear the process that is using the port.