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I am using ubuntu 16.04 for programming purposes. When I am trying to connect to my "Atmel Corp. AVR ISP mkII microcontroller" & "FT232 USB-Serial (UART) IC" through my controller software application it doesn't get connected and gives out an error that "inappropriate permissions on device!".

When I plug in the device, it is seen as /dev/ttyUSB0 being an FTDI chip.

Any Idea on how to make the device get connected?

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Add your user to the appropriate group - dialout with the command below:

sudo usermod -a -G dialout $USER

then logout and login back.

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  • Through the stated method, I am now able to access the atmel microcontroller in serial mode through /dev/ttyUSB0 in the controller software. But I am not able to access the FTDI chip. In the FTDI mode in controller software it still says that "inappropriate permissions on device!". Is there any solution for this? Nov 17, 2017 at 23:03
  • I do not have such programmer and software, but I think that there is some problem with permissions. Normal user can't do modprobe and so on. I found possible solution on Unix StackExchange. I can't try it.
    – N0rbert
    Nov 18, 2017 at 10:54

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