In productionProbeginnerLinux permissions
The serial port denies access
Allow the robot service to open its controller without running it as root.
Pairs with Linux evidence toolkit in Robotics Development Setup & Recovery. Read the concept first, then diagnose it here.
Unlock this lab with ProOperator report
`open(/dev/ttyUSB0)` returns permission denied for the service user.
Ubuntu 24.04 setup emulator, isolated disk images, Linux recovery shell, ROS 2 Jazzy
System boundary
Trace only the relevant path.
udev device nodeUnix group permissionsrobot service
How this lab works
You diagnose it — no command list.
Open the repair workspace and gather your own evidence in a real terminal. No diagnostic commands are handed to you — finding the fault is the exercise. Stuck? Progressive hints unlock inside the workspace.
Verification
Your repair must pass more than the visible symptom.
- Service opens device
- Service does not run as root
- Hidden regression behavior
- Root cause explanation