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Cannot open /dev/ttyUSB0: Permission denied #26
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I'm not a dev on this project, just a user so if anyone else wants to jump in please do: This is not an issue with the esp8266, and its not actually a bug at all, its just part of Linux. Its best practice to not change permissions in /dev unless as a last resort. What you want to do instead is to add yourself to the group which would give you permission to access the tty ports. To see the groups you are in simply type:
To see all available groups type:
Most of them are self-explanatory, in this case you want to add yourself to either the tty group, or dialout, which you would do by:
Then your user should have access to tty without use of sudo. |
After the |
I had to add my user to group "dialout" too (ubuntu). Logout/login required. |
Thank you people, it helped me to get access to my 3d printer from Klipper on Raspberry Pi! |
PROPER LOGOUT IS REQUIRED |
Can this issue be added to the install documentation? Or even better, is there a way to automate handling it? |
this is actually a permission problem u have to allow your Arduino IDE to access the specified port just simply type following commands in your terminal sudo su |
thank you shamo1, it helped me |
thanks shamo1, that worked for me too! |
I add myself to dialout group and it works: |
Indeed, without being member of the "dialout" group, the access to the ttyUSB is not granted. |
note for future users who are curious about this Problem Solution For anyone who likes knowing what they're running before they run it: bonus notes: This is the 'linux way' to solve the problem. Adding the user to the group with permission to use the device is much safer than changing the permissions of the device itself. And as others have mentioned, make sure you log out for the changes to take effect. |
thanks @shamo1 ! I tried adding myself to tty and dialout group and it worked after logging back in... but the next day it gave same error but I was still a member of those groups. Had to add chown ttyUSB0 through root and it worked! |
For anyone using Arch Linux, Arch has a separate user group for serial ports called uucp. |
Thanks for that! |
This worked better for me !! They should include this on documentation !! Thankyou @shamo1 !!!!!! |
This one worked for me with ESP32 |
In addition to adding my user to the
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it's helpful ,thank you |
thanks people!! |
thanks you, it solve the problem, you're a genius |
This solves my problem, thanks! |
Hi ,just look at this issue and I found a better solution .
This ruler file is from platformio. And you also need to join group
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and remember to logout/login.. |
This worked for me Ubuntu 20.04 |
This is the safest, cleanest and most reliable answer. Don't just go round changing ownership, make yourself a member of that devices ownership group. Thank you @m-atoms for the clear explanation. EDIT: |
Thanks for basic solution. @shamo1 |
Used Node.js installation method. Faced permission issues accessing device. Tried the suggested method in the FAQ with no success. Found this esp8266/source-code-examples#26 forum that provided the following approach: Add user to the `uucp ` , `tty ` , `dialout ` groups: ``` sudo usermod -a -G uucp $USER sudo usermod -a -G tty $USER sudo usermod -a -G dialout $USER ``` The particular group that would make it work depends on the type of serial connection and linux distribution. I think this would be a more simple solution but just wanted to bring some light to this with the hopes that someone more knowledgeable could provide a more educated opinion. Cheers!
I did all the above, but I still get this error:
I also did this: |
It wasn't a matter of permissions, it was a bad USB port. I tried one in the front and it works now. |
group memberships to dialout or tty not helped here. go with chown on the file from root solved it for me. |
Legend! |
follow command worked for me . sudo chown -R user_name /dev/ttyUSB0 |
You're a legend thanks :-) I am new to Arch so this really helped me. |
I also encountered this error message. However, I changed the baud rate to 115200 by adding |
All-In-One command:
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This is the one that worked - the trick was that I had to specifically put my actual username, not some variation of $USER. |
My user have added to |
Just a heads up, if your serial port is owned by root, as mine is, this will make your account a member of root. |
on Fedora add your user to dialoout group. |
On Ubuntu, the tty are owned by “root”. What do you suggest there?
Thanks
Dave
… On Aug 5, 2022, at 10:05 PM, Evgeniy Ivanov ***@***.***> wrote:
on Fedora add your user to dialoout group.
sudo usermod -a -G dialout user_name
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You are receiving this because you commented.
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Maybe your usb device is numbered different. Worked for me. |
But that’s exactly what I did in the video and you called it a hack…. So I’m confused!
From: ChuckNorrison ***@***.***>
Sent: Sunday, August 7, 2022 1:12 PM
To: esp8266/source-code-examples ***@***.***>
Cc: David W Plummer ***@***.***>; Comment ***@***.***>
Subject: Re: [esp8266/source-code-examples] Cannot open /dev/ttyUSB0: Permission denied (#26)
On Ubuntu, the tty are owned by “root”. What do you suggest there? Thanks Dave
…
On Aug 5, 2022, at 10:05 PM, Evgeniy Ivanov @.***> wrote: on Fedora add your user to dialoout group. sudo usermod -a -G dialout user_name — Reply to this email directly, view it on GitHub <#26 (comment) <#26 (comment)> >, or unsubscribe https://github.com/notifications/unsubscribe-auth/AA4HCFZBOTH4V23OQ4JYLUDVXXXAFANCNFSM4DTOUWFA. You are receiving this because you commented.
cd /dev
sudo chown username ttyUSB0
Maybe your usb device is numbered different. Worked for me.
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On ubuntu the problem here is likely that brltty is stealing it. Try "apt remove brltty" |
Perfekt, man! That was my Issue on Xubuntu. Thanks! |
On the off chance anyone is running into this issue on NixOS, the solution is to add your
Followed by running |
It solved my problem, thanks, but I have to rewrite the code every time I remove and plug in the TTL converter. Is there a way I can fix it in one go? |
This one worked for me on fedora linux with a nodeMCU esp8266 |
Thank you, shamo1 in Debian12 and ArduinoIDE2.2.3 it works right away. |
I had an issue , while trying to do flash
Cannot open /dev/ttyUSB0: Permission denied
https://bugs.launchpad.net/ubuntu/+source/gtkterm/+bug/949597
I palliated to this problem with the command " sudo chmod -R 777 /dev/ttyUSB0 " each time I wanted to flash.
Do you know more about these bugs ? This maybe due to an ubuntu bug (Ubuntu 16 LTS) but I don't know
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