I have a problem with my Arduino Uno board. It's not mounting in my Linux machine, but its power is on and the LED light is glowing. It was working before. After I tested buttons with an 12 V external supply, I am facing this scenario.
lsusb and I checked
/dev/ ports. Also, I couldn't find `ttyACM. I tried with another Arduino board and it's working. I think the board is gone, and I need help to fix this problem.
I thought it was a bootloader problem, and I got a new ATmega328P chip board. It is getting power on and the LED is blinking, but the port is not mounted. I tried with
lsusb and also
ls /dev/ttyACM* with no result.