"Failed to open serial port" in Linux

[RahulGoyal-tech]

Describe the bug

I have connected the flight controller to pc and it is being automatically detected by betaflight but whenever i try to connect, it shows failed to open serial port. Please suggest what should i do because my kernel is 5.x.x version so there is no installation available for cp210x

To Reproduce

happening in my system

Expected behavior

connect successfully to fc

Configurator version

10.8.0

Flight controller configuration

No response

Add any other context about the problem that you think might be relevant here

No response

[haslinghuis]

Please check https://betaflight.com/docs/development/building/Building-in-Ubuntu

[RahulGoyal-tech]

Thank you so much. It worked perfectly 😊

[TheForsakenSpirit]

@haslinghuis can you update link or add solution description?

[haslinghuis]

Link has been updated.

[nerdCopter]

@haslinghuis can you update link or add solution description?

@TheForsakenSpirit , this is fairly concise as well: https://hackmd.io/@nerdCopter/H1dtIuUSn

[passalini]

One more solution (without building) after pluguing usb run: sudo chmod 0777 /dev/ttyACM0

[adii-n]

sudo chmod 777 /dev/tty/ACM0 works perfectly for me to make the com port recognizable. The only issue is that I have to run the command every time betaflight restarts; is there any way to make the change permanent?

[nerdCopter]

0777 is a workaround, the proper solution is udev rules and user groups. see official docs or the link i posted above.

[kiranze]

One more solution (without building) after pluguing usb run: sudo chmod 0777 /dev/ttyACM0

Thanks man, worked immediately

[Juribiyan]

For udev rules and usergroups follow the instructions provided by the ExpressLRS Configurator. It worked for me.