[Bug 1728055] [NEW] GDM3 hangs, if local home directory is not accessible

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In Ubuntu 17.10 with GDM 3.26.1-3ubuntu3, the greeter will hang, if
local /home directory is not accessible.

Our setup:
- Ubuntu Server (16.04) with DNS, LDAP, Kerberos 5 and NFS servers. The home directories are present on the server and made available via NFS with krb5 authentication. LDAP provides the user data for clients.
- Ubuntu client (17.10), bound to the server, uses AutoFS to automount remote home directories under /home. This makes the otherwise present local user directories unaccessible.

Expected behaviour: After system startup, the greeter should provide a way for users to log in.
Actual behaviour: The system hangs before the greeter displays the user list (but it does display the top menu bar and Ubuntu logo at the bottom).

Additional remarks:
If the settings for local users under /var/lib/AccountsService/users contain SystemAccount=true, the greeter will work as expected (while not displaying local users). This is a workaround, that I'm using right now. BUT: if the network user will log in and invoke the authentication dialog for system-wide settings (e.g. if he will try to add a new printer, or change the system update settings), the system will hang before displaying the expected dialog window. Also if a local user will try to log in by entering his login name and password, the system will hang (it should either produce an error message, or log in without a home directory).

AutoFS uses this line to mount the remote home directories under /home:
* -fstype=nfs4,rw,intr,sec=krb5 FQDN:/home/&

** Affects: autofs (Ubuntu)
     Importance: High
         Status: New


** Tags: artful autofs automount gdm3
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GDM3 hangs, if local home directory is not accessible
https://bugs.launchpad.net/bugs/1728055
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