useradd is not supposed to put the user into any group, it's a very low- level tool. If you add users with the 'Users and groups' gnome tool, they will get the 'desktop' profile by default which includes audio access.
** Changed in: control-center (Ubuntu) Importance: Medium => Low Status: Needs Info => Confirmed -- gnome-sound-properties empty "Default sound card:" list https://launchpad.net/bugs/48545 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs