Public bug reported:
1.Choose System/Administration/Login Window/Accessibility/Enable accessible login;
2.Choose System/Quit/Log Out;
3.Click ok;
4.Choose Actions/Remote Login via XDMCP;
5.Appear warning notice like result of step 2.
** Affects: gdm (Ubuntu)
Importance: Untriaged
Status: Unconfirmed
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XDCMP can't use
https://launchpad.net/bugs/55572