I have just verified bionic. With version 237-3ubuntu10.34 after replaying test case from the description I see the groups from /etc/security/group.conf (dialout, users) added:
ubuntu@bionic:~$ groups ubuntu adm dialout cdrom sudo dip plugdev users lpadmin sambashare vboxsf
I have just verified bionic. With version 237-3ubuntu10.34 after replaying test case from the description I see the groups from /etc/security/ group.conf (dialout, users) added:
ubuntu@bionic:~$ groups
ubuntu adm dialout cdrom sudo dip plugdev users lpadmin sambashare vboxsf