users-admin doesn't completely delete user accounts

[Matthew]

users-admin doesn't completely delete user accounts when the user's home folder has been encrypted and the user has logged in at least once.

Steps to reproduce:
1. Create a new user using users-admin, making sure to check "Encrypt home folder to protect sensitive data"
2. Log into new user account
3. Log out and back into original user account
4. Using users-admin, attempt to delete newly created account, opting to delete home folder. The account will disappear from the list of user accounts however the account hasn't been properly deleted and will reappear if users-admin is started again and will also appear in the login manager. The home directory has been deleted but the account persists in /etc/passwd.

Accounts are properly deleted when the user's home folder is not encrypted or the user hasn't logged in at least once.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-system-tools 3.0.0-2ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Tue May 22 08:16:46 2012
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: gnome-system-tools
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.