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[Marco Leichsenring <marco.leichsenring.ext@xxxxxxxxxxxxxxxxx>]

perhaps an strace might help...the group I want to have as primary group
is called DummyGroup here and is part of an active directory
infrastructure. In 12.04 everything worked and I was able to change to
that group.

** Attachment added: "stracenewgrp.log"
   https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1355111/+attachment/4183244/+files/stracenewgrp.log

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https://bugs.launchpad.net/bugs/1355111

Title:
  newgrp fails with "crypt: Invalid argument"

Status in “shadow” package in Ubuntu:
  Confirmed

Bug description:
  entry from /etc/passwd:
  user:x:1000:1000:User,,,:/home/user:/bin/bash

  entry from /etc/group:
  dummy:x:200:user

  entry from /etc/gshadow:
  dummy:*::

  logged on as user the command
  "newgrp dummy" asks for a password and fails with "crypt: Invalid argument"

  after removing the line for dummy from gshadow newgrp works

  
  A similar bug was reported on the redhat tracker: https://bugzilla.redhat.com/show_bug.cgi?id=988184

  
  cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=14.04
  DISTRIB_CODENAME=trusty
  DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"

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