[ubuntu-mono] [Bug 1575182] Re: sysinfo crashes on ubuntu 16.04 (since upgrade)

[Ubuntu Foundations Team Bug Bot]

The attachment "16-fix-gnome-version-detection.patch" seems to be a
patch.  If it isn't, please remove the "patch" flag from the attachment,
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** Tags added: patch

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https://bugs.launchpad.net/bugs/1575182

Title:
  sysinfo crashes on ubuntu 16.04 (since upgrade)

Status in sysinfo package in Ubuntu:
  Confirmed

Bug description:
  I start it from the cli and the crash information is:

  sysinfo 
  Exception in Gtk# callback delegate
    Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
  System.NullReferenceException: Object reference not set to an instance of an object
    at Sysinfo.SystemInfo.Gnome () <0x40f74570 + 0x000a8> in <filename unknown>:0 
    at Sysinfo.Sysinfo.on_notebook1_switch_page (System.Object o, Gtk.SwitchPageArgs e) <0x40f6dda0 + 0x0011b> in <filename unknown>:0 
    at Gtk.Notebook.SwitchPageSignalCallback (IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch) <0x40f6d580 + 0x002f7> in <filename unknown>:0 
    at GLib.ExceptionManager.RaiseUnhandledException (System.Exception e, Boolean is_terminal) [0x00000] in <filename unknown>:0 
    at Gtk.Notebook.SwitchPageSignalCallback (IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch) [0x00000] in <filename unknown>:0 
    at Gtk.Notebook.gtk_notebook_set_current_page (IntPtr , Int32 ) [0x00000] in <filename unknown>:0 
    at Gtk.Notebook.set_CurrentPage (Int32 value) [0x00000] in <filename unknown>:0 
    at Sysinfo.Sysinfo.on_treeview1_cursor_changed (System.Object o, System.EventArgs e) [0x00000] in <filename unknown>:0 
    at System.Reflection.MonoMethod.InternalInvoke (System.Reflection.MonoMethod , System.Object , System.Object[] , System.Exception& ) [0x00000] in <filename unknown>:0 
    at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
    at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0 
    at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0 
    at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0 
    at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] in <filename unknown>:0 
    at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0 
    at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0 
    at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) [0x00000] in <filename unknown>:0 
    at Gtk.Application.gtk_main () [0x00000] in <filename unknown>:0 
    at Gtk.Application.Run () [0x00000] in <filename unknown>:0 
    at Sysinfo.Sysinfo..ctor (System.String[] args) [0x00000] in <filename unknown>:0 
    at Sysinfo.Sysinfo.Main (System.String[] args) [0x00000] in <filename unknown>:0 

  ------------------

  apt-cache policy sysinfo returns:
  sysinfo:
    Installed: 0.7-10
    Candidate: 0.7-10
    Version table:
   *** 0.7-10 500
          500 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
          500 http://archive.ubuntu.com/ubuntu xenial/universe i386 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: sysinfo 0.7-10
  ProcVersionSignature: Ubuntu 4.4.0-22.38-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Tue Apr 26 15:08:14 2016
  InstallationDate: Installed on 2012-04-12 (1475 days ago)
  InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  PackageArchitecture: all
  SourcePackage: sysinfo
  UpgradeStatus: Upgraded to xenial on 2016-04-24 (1 days ago)

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