Ubuntu
shadow package

  1. Bug #238755
  2. Comment #7

Comment 7 for bug 238755

Revision history for this message
x (xk2c-deactivatedaccount) wrote : Re: 'Account has expired' message when adding a new user

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=389183

it has been changed in debian that way.
Don't know if it has been intentional introduced to Ubuntu.