Linux - USB device: Permission denied

I have a problem uploading sketches to the Blinks Interface

The copied error message is:
Arduino: 1.8.15 (Linux), Board: “Blink”

An error occurred while uploading the sketch
avrdude: Version 6.3-20190619
Copyright © 2000-2005 Brian Dean,
Copyright © 2007-2014 Joerg Wunsch

     System wide configuration file is "/home/duke/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf"
     User configuration file is "/home/duke/.avrduderc"
     User configuration file does not exist or is not a regular file, skipping

     Using Port                    : usb
     Using Programmer              : usbtiny
     Setting bit clk period        : 5.0

avrdude: usbdev_open(): Found USBtinyISP, bus:device: 002:013
avrdude: Warning: cannot open USB device: Permission denied
avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)

avrdude done. Thank you.

My Linux:
Linux Mint 20 Cinnamon 4.6.7 5.4.0-73-generic

The user is already in the group “dialout”

I have 3 serial Ports
ttyACM0 ttyACM1 ttyACM2
it works with none of those

The same Blink Hardware works on an other WIN10 PC without problems.

What can I do?

give this a shot :slight_smile:

I followed every step from the link, but I’m sorry - it did not help

I am not familiar with Linux Mint but in my Ubuntu desktop, here is the udev rule I am using:

ATTR{idVendor}=="1781", ATTRS{idProduct}=="0c9f", MODE="660", GROUP="dialout"

This is inside a block for the usb_device subsystem so a self-contained version would probably be something like:

SUBSYSTEM="usb_device", ATTR{idVendor}=="1781", ATTRS{idProduct}=="0c9f", MODE="660", GROUP="dialout"