Just experienced this issue. Used TJ's fix with success, but I had to also restart nfs on the server - multiple restarts of idmapd did nothing. I did not try restarting the client.
FWIW, here's my details. Primary difference is that my server is a CentOS box. Client: Linux 3 3.11.0-23-generic #40~precise1-Ubuntu SMP Wed Jun 4 22:06:36 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux nfs-common 1:1.2.5-3ubuntu3.1 nfs4-acl-tools: 0.3.3-1 nfswatch: 4.99.11-1 Server: Linux <snip> 2.6.32-431.5.1.el6.x86_64 #1 SMP Wed Feb 12 00:41:43 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux nfs-utils-1.2.3-39.el6.x86_64 nfs-utils-lib-1.1.5-6.el6.x86_64 nfs4-acl-tools-0.3.3-6.el6.x86_64 -- 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/nfs-utils/+bug/976632/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs