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Unable to Open Com Port [closed]

asked 2021-05-28 19:56:51 -0500

mfatih gravatar image

Hi AskUbuntu community.

I want ask a question about the opening of serial ports in Ubuntu. I use Ubuntu 20.04 in my MSI computer.

I want to access a hardware device (A GPS unit) via USB cable. I installed the ROS2 driver of the device and tried the below code example:

ros2 launch sbg_driver

After that I got the error message: sbgInterfaceSerialCreate: Unable to open the com port: /dev/sbg

To fix the error, I added myuser to dialout and tty groups but the error did not be fixed.

Can you help me?

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Closed for the following reason duplicate question by gvdhoorn
close date 2021-06-01 14:22:11.641910



This is clearly a cross-post (the OP hasn't even removed the salutation) of Unable to Open Com Port on AskUbuntu.

The cross-post there even has responses.

@mfatih: please do not cross-post, or at least not within a day.

gvdhoorn gravatar image gvdhoorn  ( 2021-06-01 14:23:44 -0500 )edit

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answered 2021-06-01 13:07:26 -0500

djchopp gravatar image

updated 2021-06-01 13:10:47 -0500

Chances are your serial device is not named /dev/sbg


  1. Unplugging your usb->serial converter.
  2. Run ls /dev in a terminal
  3. Plug in the usb->serial converter
  4. Run ls /dev again.
  5. Look for a newly added device (probably something like /dev/ttyUSB0)
  6. Edit config/sbg_device_uart_default.yaml to use the new device instead of /dev/sbg
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Thanks, this method fixed my problem.

mfatih gravatar image mfatih  ( 2021-06-04 00:30:55 -0500 )edit

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Asked: 2021-05-28 19:56:51 -0500

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Last updated: Jun 01 '21