The body of the bug report was empty, and I can not confirm the non working of the option.
The documentation says that the EXTRA_GROUPS (settable only from the configuration file) are only used for new non-system user iff either ADD_EXTRA_GROUPS is set or --add_extra_groups is set on the command line. This is how adduser in unstable behaves. root@salida-unstable-buildd-amd64-5okx:/srv# addgroup foo Adding group `foo' (GID 1000) ... Done. (add foo to EXTRA_GROUPS in adduser.conf) root@salida-unstable-buildd-amd64-5okx:/srv# adduser foo1 root@salida-unstable-buildd-amd64-5okx:/srv# getent group foo foo:x:1000: root@salida-unstable-buildd-amd64-5okx:/srv# adduser --add_extra_groups foo2 root@salida-unstable-buildd-amd64-5okx:/srv# getent group foo foo:x:1000:foo2 (set ADD_EXTRA_GROUPS in adduser.conf) root@salida-unstable-buildd-amd64-5okx:/srv# adduser foo3 root@salida-unstable-buildd-amd64-5okx:/srv# getent group foo foo:x:1000:foo2,foo3 And we didnt break that behavior in git head. What is the bug that is being reported here? Greetings Marc