Fixing Linux write permission for /dev/ttyUSB0

Comments

• kzz

  January 2016

  Resolved: it was a permissions problem.
  % ls -lh /dev/ttyUSB0
  crw-rw---- 1 root dialout 188, 0 Jan  9 22:44 /dev/ttyUSB0
  
  After adding my user to the dialout group, it works.
  
• leka0024

  February 2016

  I used 'sudo usermod -a -G dialout [user]' to add my user to the 'dialout' group, but that still gave me the error message "[Errno 13] Permission denied: '/dev/ttyUSB0' ".
  
  Then I used 'sudo chmod 666 /dev/ttyUSB0' to add 'rw_' for all users. That did the trick for me, the user.py program is now running correctly.
  
• ayushmh

  June 2016

  this is how my problem solved was solved :
  With it, you script various things to happen, including setting permissions.

  Run sudoedit /etc/udev/rules.d/50-ttyusb.rules and stick this in there:

  KERNEL=="ttyUSB[0-9]*",NAME="tts/USB%n",SYMLINK+="%k",GROUP="uucp",MODE="0666"
  

  Save, exit and replug and you should be up and running. Setting the permission to 666 allows anybody to write to the device.
• wjcroft Mount Shasta, CA

  June 2016

  On Ubuntu, the simplest way to resolve the permissions problem, is to add yourself to the 'dialout' user group.

  
  

  $ ls -l /dev/ttyU*

  crw-rw---- 1 root dialout 188, 0 Jun 12 13:28 /dev/ttyUSB0

  $ sudo adduser yourusername dialout

  
  

  For the group change to take effect the first time, you need to log out and back in again.
• aarohi1510001 Ghaziabad, Delhi

  September 2017

  What if the GUI recognizes the dongle only once and not anytime thereafter? Even though the blue light appears on both the components but it never says system is up in ubuntu 16.04?
• Carrie22 United States

  April 2018

  Is there a solution for running on windows??