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Getting into arduino and followed the instructions at: https://www.arduino.cc/en/Guide/Linux

Since I'm having issues writing to the serial port, I did the following as instructed (my username is thomas):

ls -l /dev/ttyACM*

which returned

crw-rw---- 1 root dialout 166, 0 Nov 11 08:57 /dev/ttyACM0

so then I wanted to add myself to the group dialout. Per instructions:

sudo usermod -a -G dialout thomas

then I typed groups:

thomas adm cdrom sudo dip plugdev lpadmin lxd sambashare docker

Logging back in made no difference.

Dug for a while found out something about newgrp on stackeoverflow. Running that seemed to add me to the group, but didn't fix my issue. Logged out and back in and no longer member of the group.

thomas@bravos:~$ grep thomas /etc/group
adm:x:4:syslog,thomas
dialout:x:20:thomas
cdrom:x:24:thomas
sudo:x:27:thomas
dip:x:30:thomas
plugdev:x:46:thomas
lpadmin:x:120:thomas
lxd:x:131:thomas
thomas:x:1000:
sambashare:x:132:thomas
docker:x:1002:thomas

shows me as part of the list.

WTF???

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1 Answer 1

Reset to default
1

Rebooting seems to have fixed the problem. Evidently logging out and in is not sufficient.

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  • the groups are not updated in a running session, this is right. Relogin would be enough, but your reboot is also good. For a one-time execution, there also is sg. It is similar to su, but for groups sg -dialout -c "any command"
    – LupusE
    Nov 11, 2020 at 15:57

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