Never mind what I said. Uncommenting the line "Domain = localdomain" on /etc/idmapd.conf solved the problem. It seems that Ubuntu 12.04 comes with different defaults; on my 11.10 client machine, this line is uncommented.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/976632 Title: nfs4 mounts are not mapping userids, uses nobody/nogroup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/976632/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs