Fix “/dev/ttyACM0 Permission Denied” in Linux | Udev Rules for Serial Devices
Getting the “Permission denied” error when trying to access /dev/ttyACM0 on Linux without root? This step-by-step guide explains why your Raspberry Pi Pico, Arduino, or other USB serial devices require root privileges — and how to fix it permanently with a simple udev rule.
In this video, you’ll learn:
How Linux permissions and udev rules work for serial devices
How to create a custom udev rule so /dev/ttyACM0 is always accessible
How to reload udev rules without rebooting
Commands covered:
ls -l /dev/ttyACM0
sudo nano /etc/udev/rules.d/50-ttyacm.rules
sudo udevadm control --reload-rules
sudo udevadm trigger
Whether you’re working with a Raspberry Pi Pico, Arduino, or any USB CDC device, this fix will save you from running serial connections as root every time.
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