Cant open device message on Linux

Hi, I just installed Arduino on Linux Ubuntu.

Tried to test it with "blink" example but have been unable to upload the sketch. My error message is :

avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied

Tried with three different Nano board. Any ideas?

Worked right away! Thanks! :slight_smile:

Hi, this didn't work for me, when I try to run:

ls -l /dev/ttyACM

I get:
ls: cannot access '/dev/ttyACM': No such file or directory

I also tried running:
ls -l /dev/ttyUSB0

Same results.

Any ideas?


ls -l /dev/ttyACM*
ls -l /dev/ttyUSB*

Plug your Arduino into the USB and run:

sudo dmesg