Comment 8 for bug 772076

Lubuntu installation:
.../etc$ cat issue
Ubuntu 11.04 \n \l

I install giver 0.1.8-6 via Synaptic. It fails to run, as per other reports:

$ giver
[Debug]: PhotoService static constructor called
[Debug]: New GiverService was created
[Debug]: We have the port : 56308
[Debug]: About to create the Avahi client
[Debug]: Adding Avahi Service _giver._tcp
[Debug]: GiverService:OnEntryGroupStateChanged was called state: Registering
[Debug]: Avahi Service _giver._tcp is added
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.DllNotFoundException: libX11.so
  at (wrapper managed-to-native) Egg.TrayIcon:XInternAtom (intptr,string,bool)
  at Egg.TrayIcon.OnRealized () [0x00000] in <filename unknown>:0
  at Gtk.Widget.realized_cb (IntPtr widget) [0x00000] in <filename unknown>:0
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.realized_cb(IntPtr widget)
   at Gtk.Widget.gtk_widget_show_all(IntPtr )
   at Gtk.Widget.ShowAll()
   at Giver.Application.SetupTrayIcon()
   at Giver.Application.InitializeIdle()
   at GLib.Idle+IdleProxy.Handler()
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Gnome.Program.Run()
   at Giver.Application.StartMainLoop()
   at Giver.Application.Main(System.String[] args)

Now install libx11-dev using Synaptic (libx11-6 already installed: it's a dependency for giver, according to Synaptic). And...

$ giver
[Debug]: PhotoService static constructor called
[Debug]: New GiverService was created
[Debug]: We have the port : 56308
[Debug]: About to create the Avahi client
[Debug]: Adding Avahi Service _giver._tcp
[Debug]: GiverService:OnEntryGroupStateChanged was called state: Registering
[Debug]: Avahi Service _giver._tcp is added
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.DllNotFoundException: libX11.so
  at (wrapper managed-to-native) Egg.TrayIcon:XInternAtom (intptr,string,bool)
  at Egg.TrayIcon.OnRealized () [0x00000] in <filename unknown>:0
  at Gtk.Widget.realized_cb (IntPtr widget) [0x00000] in <filename unknown>:0
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Widget.realized_cb(IntPtr widget)
   at Gtk.Widget.gtk_widget_show_all(IntPtr )
   at Gtk.Widget.ShowAll()
   at Giver.Application.SetupTrayIcon()
   at Giver.Application.InitializeIdle()
   at GLib.Idle+IdleProxy.Handler()
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Gnome.Program.Run()
   at Giver.Application.StartMainLoop()
   at Giver.Application.Main(System.String[] args)

So that workaround didn't do it for me. In a previous Lubuntu 10.10 installation I had on this machine (Dell Dimension 2400), giver used to run successfully.