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[Robert Euhus <1290785@xxxxxxxxxxxxxxxxxx>]

I was not yet able to test the fix mentioned above. But I noticed that with my workaround the user "nobody" (uid 65534) is listed as in lightdm.
It is listed by accountsservice if I query it via dbus:

root@pc:~/tmp# qdbus --system org.freedesktop.Accounts
/
/org
/org/freedesktop
/org/freedesktop/Accounts
/org/freedesktop/Accounts/User65534
[..]
/org/freedesktop/Accounts/User1000

Hopefully this has been taken care of in the patched version?

I'll try to test the utopic version tomorrow.

@Robert Ancell: 
1. is this the correct way to restart the accountsservice?:
/usr/lib/accountsservice/accounts-daemon --replace &

2. I couldn't find a lot of documentation for accountsservice could you
give me a hint for a good start?

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https://bugs.launchpad.net/bugs/1290785

Title:
  Users with UID > 60000 are invisible in login and Settings->User
  unless /etc/login.defs updated

Status in “accountsservice” package in Ubuntu:
  Fix Released
Status in “accountsservice” source package in Trusty:
  Triaged

Bug description:
  [Impact]
  Users of Ubuntu 14.04 LTS with UID > 60000 will not show in the greeter or system settings without editing UID_MAX in /etc/login.defs. This was not required in 12.04 LTS. In 12.04 LTS users were only hidden if they had UID < UID_MIN. In 13.10 this was changed to UID < UID_MIN or UID > UID_MAX.

  [Test Case]
  1. Create a user with a UID > UID_MAX:
  $ adduser --uid 60001 big-uid
  2. Restart system
  Expected result:
  "big-uid" is shown in the greeter. Once logged in "big-uid" is shown in system settings.
  Observed result:
  "big-uid" is not shown in the greeter (14.04 LTS, 14.10)
  "big-uid" is not shown in system settings (13.10, 14.04LTS, 14.10)

  [Regression Potential]
  This could cause users that were previously hidden to be shown. This seems unlikely to be a problem as all system created user accounts are less than UID_MIN and there doesn't seem be a convention to use accounts > UID_MAX for this case.

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