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I've added myself to the dialout group and run 

getent group dialout

and it returns

dialout:x:20:myUserName

I try to access the serial port and am getting...

[Errno 13] could not open port
/dev/ttyACM0: [Errno 13]
Permission denied '/dev/attyACM0'

So clearly I've left a step out.

Zanna
  • 70,465
Charlie RC
  • 299

1 Answers1

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You need to log out and log in for the group changes to apply. (other solutions might be possible)

Lets walk trough this. I am currently not member of dialout

getent group dialout
dialout:x:20:

Now I add myself

sudo usermod -aG dialout myUser

and verify

getent group dialout
dialout:x:20:myUser

However getent just looks at the configuration not at the current state (which is not updated). You can see this by looking at groups 

groups
myUser adm cdrom sudo dip plugdev lpadmin sambashare docker

no dialout here. After relogin it will work

mbeyss
  • 978