I was getting this issue on ubuntu 15.04 (Vivid Vervet) too... However I've found a workaround, running 'grpconv' as root fixed the problem for me.
-- 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/shadow/+bug/1355111/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs