Error message id: cannot find name for group ID after logging in

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http://unix.stackexchange.com – BACKGROUND Trevor logs into his account on ssh://foobar.university.edu as one of the developers on the box, and he gets the message: id: cannot find name for group ID 131 Trevor then checks this out using vim /etc/group PROBLEM Trevor discovers that there is no 131 anywhere in the /etc/group file. Trevor then runs id ... > id trevor uid=4460(trevor) gid=131 groups=48(foobar),51(doobar),131 To discover his primary group apparently does not have a name attached to it. QUESTIONS What likely happened to cause this circumstance on the foobar.university.edu box ? Suppose trevo (HowTos)