I'm new to Linux. I downloaded Arduino today, but the port part does not open.

I am making a new project and I cannot upload this project to Arduino because the port part is closed.

iptables

https://www.ipserverone.info/knowledge-base/how-to-open-ports-in-iptables/

I suspect that you men that you can't upload the coda to a Arduino over USB? If that's the case: 1. First check which group owns the USB serial port, example: ls -l /dev/ttyACM* Result: crw-rw---- 1 root dialout 188, 0 5 apr 23.01 ttyACM0 2. Add your user to the group dialout with the command sudo usermod -a -G dialout <username> 3. Logout and login to make the changes take effect.