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Linux Mastering Development

Why the USB serial port or openocd won’t open without root permission?

minicom or openocd command won’t run without root permission on a Ubuntu 16.04 system.

In the past, I was able to open serial port without root permission.

I verified that the current user exist in dialout and plugdev groups. Also, I don’t know if it matters but since this looks like a USB issue, I have three USB dongles – Wi-Fi, Bluetooth, and Logitech Unifying receiver connected.

Any thoughts on what could be going on?

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