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["R. Becke" <subscribe.becke@xxxxxxxxx>]

Sorry but my workaround was incomplete - i.e. to clean up the login screen (and clean up the cached passwords) I use the following commands:
sudo rm /var/lib/sss/db/*
sudo rm /var/lib/sss/mc/*
sudo rm -rf /var/lib/lightdm/.cache
sudo rm -rf /var/cache/lightdm
sudo rm -rf /var/log/wtmp
And reboot the machine

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Touch seeded packages, which is subscribed to accountsservice in Ubuntu.
https://bugs.launchpad.net/bugs/988072

Title:
  Can't remove user if they're not in /etc/passwd

Status in accountsservice package in Ubuntu:
  Confirmed

Bug description:
  Thanks to nss, there are many ways for a user account to exist.

  If you have user accounts authenticated with LDAP (say), and use nss
  tables other than passwd to store user information, then you find that
  the system automatically creates an entry in the user account database
  on login. This is handy: it means the user gets listed by lightdm in
  the greeter, for example, and things like background and keyboard
  prefs can be known to the greeter. It's all good.

  However, these users cannot be deleted. If you use the accounts-daemon
  from the control center to remove them, you get this error:

  Failed to delete user
  GDBus.Error:org.freedesktop.Accounts.Error.Failed: running '/usr/sbin/userdel' failed: /usr/sbin/userdel returned an error (1): userdel: cannot remove entry 'tbushnell' from /etc/passwd

  And alas, the user then stays in the system database.

  Please make it possible to remove users from the system database even
  if deluser and userdel don't work on them.

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