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i have quectel EC 25 modem in my pc. i am using ubuntu 16.04 OS. while using minicom it showing this minicom: cannot open /dev/ttyUSB3: Device or resource busy error.

srg
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1 Answers1

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You have two options:

  1. Use minicom with sudo.

  2. Add your user to the dialout group by

    sudo usermod -aG dialout $USER

Logout and login. After that you'll be able to reach your modem without sudo.

Pilot6
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  • With Mobian on the PinePhone, my user was already added to the dialout group after installing minicom. However logging out or restarting the device did not fix the issue. I had to use sudo. – baptx Aug 06 '24 at 18:54