I noticed that I forgot to attach the server output described above.
Here it is.

** Description changed:

  Binary package hint: vino
  
  On lucid, when you set the
  /desktop/gnome/remote_access/network_interfaces gconf key to "lo", Vino
- will accept VNC connection only for the first desktop session.  If you
+ will accept VNC connections only for the first desktop session.  If you
  switch user, opening a new session as a different one, it is impossible
  to connect to that session.  It works as expected when the
  network_interfaces gconf key is not set.
  
  = Step to reproduce =
  
  1. On the target machine, open a session as one user, then switch to a
  second user.
  
- 2. From another machine, witness that you can cannot to both session by
- VNC:
+ 2. From another machine, witness that you can cannot connect to both
+ session by VNC:
  
-     $ vncviewer target:0  # VNC client screen remain black (session is 
locked), but connection is possible
-     $ vncviewer target:1  # Connection ok
+     $ vncviewer target:0  # VNC client screen remain black (session is 
locked), but connection is possible
+     $ vncviewer target:1  # Connection ok
  
  3. On the target machine, set the
- /desktop/gnome/remote_access/network_interface gconf to default to "lo".
- I think you need to reboot the machine at that point, as it seems that
- Vino continue to accept connection on non-lo interfaces (but that is not
- german to this bug).
+ /desktop/gnome/remote_access/network_interface gconf key to default to
+ "lo".  I think you need to reboot the machine at that point, as it seems
+ that Vino continue to accept connection on non-lo interfaces (but that
+ is not german to this bug).
  
  4. Try to connect remotely using ssh tunneling:
  
-     $ vncviewer -via target localhost:0  # VNC client screen remain black 
(session is locked), but connection otherwise work
-     $ vncviewer -via target localhost:1  # Connection is refused
+     $ vncviewer -via target localhost:0  # VNC client screen remain black 
(session is locked), but connection otherwise work
+     $ vncviewer -via target localhost:1  # Connection is refused
  
  
  = Expected behavior =
  
  Vino should allow incoming connection to the current foreground session,
  whether directly or through an ssh tunnel when network_interfaces is set
  to "lo".
  
- 
  vino package is version 2.28.2-0ubuntu2.

** Attachment added: "vino-server.output"
   
https://bugs.launchpad.net/ubuntu/+source/vino/+bug/707705/+attachment/1912026/+files/vino-server.output

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https://bugs.launchpad.net/bugs/707705

Title:
  Vino not accepting incoming connection to more than a single desktop
  session when the "network_interfaces=lo" option is set

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