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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1355111 Title: newgrp fails with "crypt: Invalid argument" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1355111/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs