Ok, I made a big mess in the email: I edited the text (manually) to change alex to user. Shame on me.
running the "id" command without any parameters should show you the group memberships of your shell.I *suspect* this is somehow related to systemd-logind (while systemd is not running as pid 1) I just added user to group dialout (and astonished not to have to logout in order to have updated user groups list)Well - if you run "id username", this will update immediately. But what matters is the group memberships of your *shell* - which it will get at login-time...
You're perfectly right. Thank you. A.
Hope this helps