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Topic: Permission denied on /dev/ttyACM0 (Read 142093 times) previous topic - next topic

mkikia

I'm having exactly the same issue. I have done all of the above. I am a member of the "dialout group", but I still get the error message:

"avrdude: ser_open(): can't open device "/dev/ttyS0": Permission denied"

I am trying to upload to my 3D printer Mega 2560. I am connecting the Mega from the USB port of my computer. The Mega 2560 is working as I have moved the steppers around and done some calibration as well through the graphics controller. The problem arose after I changed my computer. My operating system is Ubuntu 18.04 LTS.

Any help or advice will be greatly appreciated.

Thanks in advance

gbafamily

In Linux, the Arduino serial port is named /dev/ttyACMx where x starts at 0. If using a clone board, the serial port name may be /dev/ttyUSBx where x starts at 0.

charlescun

Arduino: 1.8.5 (Linux), Board: "Arduino/Genuino Uno"

/snap/arduino-mhall119/5/arduino-builder -dump-prefs -logger=machine -hardware /snap/arduino-mhall119/5/hardware -tools /snap/arduino-mhall119/5/tools-builder -tools /snap/arduino-mhall119/5/hardware/tools/avr -built-in-libraries /snap/arduino-mhall119/5/libraries -libraries /home/doncun/snap/arduino-mhall119/5/Arduino/libraries -fqbn=arduino:avr:uno -ide-version=10805 -build-path /tmp/arduino_build_659730 -warnings=all -build-cache /tmp/arduino_cache_412874 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/snap/arduino-mhall119/5/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/snap/arduino-mhall119/5/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/snap/arduino-mhall119/5/hardware/tools/avr -verbose /home/doncun/Documents/Arduino/Blink_led/Blink_led.ino
/snap/arduino-mhall119/5/arduino-builder -compile -logger=machine -hardware /snap/arduino-mhall119/5/hardware -tools /snap/arduino-mhall119/5/tools-builder -tools /snap/arduino-mhall119/5/hardware/tools/avr -built-in-libraries /snap/arduino-mhall119/5/libraries -libraries /home/doncun/snap/arduino-mhall119/5/Arduino/libraries -fqbn=arduino:avr:uno -ide-version=10805 -build-path /tmp/arduino_build_659730 -warnings=all -build-cache /tmp/arduino_cache_412874 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=/snap/arduino-mhall119/5/hardware/tools/avr -prefs=runtime.tools.avr-gcc.path=/snap/arduino-mhall119/5/hardware/tools/avr -prefs=runtime.tools.avrdude.path=/snap/arduino-mhall119/5/hardware/tools/avr -verbose /home/doncun/Documents/Arduino/Blink_led/Blink_led.ino
Using board 'uno' from platform in folder: /snap/arduino-mhall119/5/hardware/arduino/avr
Using core 'arduino' from platform in folder: /snap/arduino-mhall119/5/hardware/arduino/avr
Detecting libraries used...
"/snap/arduino-mhall119/5/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR   "-I/snap/arduino-mhall119/5/hardware/arduino/avr/cores/arduino" "-I/snap/arduino-mhall119/5/hardware/arduino/avr/variants/standard" "/tmp/arduino_build_659730/sketch/Blink_led.ino.cpp" -o "/dev/null"
Generating function prototypes...
"/snap/arduino-mhall119/5/hardware/tools/avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR   "-I/snap/arduino-mhall119/5/hardware/arduino/avr/cores/arduino" "-I/snap/arduino-mhall119/5/hardware/arduino/avr/variants/standard" "/tmp/arduino_build_659730/sketch/Blink_led.ino.cpp" -o "/tmp/arduino_build_659730/preproc/ctags_target_for_gcc_minus_e.cpp"
"/snap/arduino-mhall119/5/tools-builder/ctags/5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "/tmp/arduino_build_659730/preproc/ctags_target_for_gcc_minus_e.cpp"
Compiling sketch...
"/snap/arduino-mhall119/5/hardware/tools/avr/bin/avr-g++" -c -g -Os -Wall -Wextra -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR   "-I/snap/arduino-mhall119/5/hardware/arduino/avr/cores/arduino" "-I/snap/arduino-mhall119/5/hardware/arduino/avr/variants/standard" "/tmp/arduino_build_659730/sketch/Blink_led.ino.cpp" -o "/tmp/arduino_build_659730/sketch/Blink_led.ino.cpp.o"
Compiling libraries...
Compiling core...
Using precompiled core
Linking everything together...
"/snap/arduino-mhall119/5/hardware/tools/avr/bin/avr-gcc" -Wall -Wextra -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=atmega328p  -o "/tmp/arduino_build_659730/Blink_led.ino.elf" "/tmp/arduino_build_659730/sketch/Blink_led.ino.cpp.o" "/tmp/arduino_build_659730/../arduino_cache_412874/core/core_arduino_avr_uno_5ae566d2b74f299eedfb0fc6b9173d06.a" "-L/tmp/arduino_build_659730" -lm
"/snap/arduino-mhall119/5/hardware/tools/avr/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0  "/tmp/arduino_build_659730/Blink_led.ino.elf" "/tmp/arduino_build_659730/Blink_led.ino.eep"
"/snap/arduino-mhall119/5/hardware/tools/avr/bin/avr-objcopy" -O ihex -R .eeprom  "/tmp/arduino_build_659730/Blink_led.ino.elf" "/tmp/arduino_build_659730/Blink_led.ino.hex"
Sketch uses 1092 bytes (3%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
/snap/arduino-mhall119/5/hardware/tools/avr/bin/avrdude -C/snap/arduino-mhall119/5/hardware/tools/avr/etc/avrdude.conf -v -patmega328p -carduino -P/dev/ttyUSB0 -b115200 -D -Uflash:w:/tmp/arduino_build_659730/Blink_led.ino.hex:i

avrdude: Version 6.3, compiled on Jan 17 2017 at 11:00:16
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/snap/arduino-mhall119/5/hardware/tools/avr/etc/avrdude.conf"
         User configuration file is "/home/doncun/snap/arduino-mhall119/5/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/ttyUSB0
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: ser_open(): can't open device "/dev/ttyUSB0": Permission denied

avrdude done.  Thank you.

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
Error opening serial port '/dev/ttyUSB0'. Try consulting the documentation at http://playground.arduino.cc/Linux/All#Permission
processing.app.SerialException: Error opening serial port '/dev/ttyUSB0'. Try consulting the documentation at http://playground.arduino.cc/Linux/All#Permission

LeHavre

Hi Folks,
 New here.This page was helpful. Tried the

sudo adduser yourUserName dialout   

and the upload worked. But then I got a new error message.
At the IDE program tools>board I missed the right board name.
Changed it and after that it works.
Thank You all.

arjunsinghbais

try the following command

sudo chmod a+rw /dev/ttyACM0

worked for me

mac-7

sudo chmod a+rw /dev/ttyACM0

I'm glad that command line fixed the problem for some but it didn't help me

Then I ran


sudo adduser yourUserName dialout

And the linux system reported that I'm already a member of dialout

Yet still on serial port in Arduino

"Serial port com1 not found"

cswallace

sudo chmod a+rw /dev/ttyACM0 works for a single time

    "sudo usermod -a -G dialout $USER" and    "sudo usermod -a -G uucp $USER" neither work. still have to chmod everytime.

What am I missing? Obviously "USER" is changed to mine.
Thanks

mwgrootwassink

sudo usermod -a -G dialout <username> only works if you have a dialout group anyway. I had the same issue; The group did not exist and in that case adding a user to a non-existing group doesn't do anything

tximistargi

If the group dialout doesn't exist, do with the uucp group.
Moreover, create a /etc/udev/rules.d/50-myusb.rules or, if a 50-* file exists edit it and write at the end of:

KERNEL=="ttyUSB[0-9]*",MODE="0666"
KERNEL=="ttyACM[0-9]*",MODE="0666"

And re-login after.

That is all.

svanovertvelt

The issue with the permissions for /dev/ttyACM0 can be permanantly solved by adding yourself to the dialout group. You will have to logout and then log back in before the group change is recognized.

You can do this with sudo usermod -a -G dialout $USER


Resource
It worked for me.
Worked for me! Many thanks!

olusis-lv

try the following command

sudo chmod a+rw /dev/ttyACM0


--

Check this link for more info https://www.youtube.com/watch?v=Z2hlBbZu3CI
Helped me too - security issue. Thanks

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