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it gives me this error 

avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied

PLEASE HELP!!!!

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  • Pls add the output of ls -l /dev/ttyUSB0 to your question. You should be in the same group as the device.
    – Soren A
    May 6, 2020 at 8:01
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    you can not simply 'upload' to a USB serial device, which I assume you are trying. This will probably give you an idea: askubuntu.com/questions/40959/…
    – Vincent Gerris
    May 6, 2020 at 8:07
  • @VincentGerris he's using avrdude, "utility to download/upload/manipulate the ROM and EEPROM contents of AVR microcontrollers" nongnu.org/avrdude
    – kurja
    May 6, 2020 at 11:17

2 Answers 2

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Looks like you do not have permission, as the error message says; for some operations avrdude needs root privileges.

To solve: add sudo in front of the command you used.

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  • Normally the right solution will be to add the user to the same group as the device. Running commands with sudo / elevateted rights should be avoided if at all possible.
    – Soren A
    May 6, 2020 at 8:03
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Add yourself to the serial port user group:

sudo usermod -a -G dialout yourusername

and then reboot.

Depending on your distro, the name of the group might change to uucp or something else.

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