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/dev/ttyACM0 permission denied on Ubuntu 24.04

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I'm struggling to access an MCU connected to the USB and presented as a serial port: /dev/ttyACM0. What worked well in Ubuntu 22.04 does not work in 24.04.Whenever I connect the device, the only way to have it access is tochmod 666 it, but that works only temporarily.

The user I'm working on is already added to the dialout group, and ls -l /dev/ttyACM0 returns: crw-rw---- 1 root dialout 166, 0 Oct 25 15:33 /dev/ttyACM0 , so as I can understand it, it is the root who has r/w and any dialout group member.Am I missing anything here to configure/add?enter image description here

Regards,

Piotr


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