Turns out this is not just a cosmetic problem, having -1 in a supplementary group list completely breaks the NFS sever as well, in a very hard to find way.
-- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to samba in Ubuntu. https://bugs.launchpad.net/bugs/1315565 Title: nss-winbind is returing -1 for supplemental groups To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1315565/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs