[ubuntu-mono] [Bug 884035] Re: Unable to execute .NET programs compiled against the v2.0 runtime: "Missing method System.Type::op_Inequality(Type, Type) in assembly /usr/lib/mono/2.0/mscorlib.dll"

[Artem Fedyuk]

One of the reasons for this error: 
(Missing method System.Type::op_Inequality(Type,Type) in assembly- /usr/lib/mono/2.0/mscorlib.dll)
can be the presence of a "SomeApplication.config" file with saved user settings, the runtime version of which is wrong. For example, the prefix part of this file might look like this:

<?xml version="1.0"?>
<configuration>
<configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
        <section name="ConsTerm.Client.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false"/>
    </sectionGroup>
</configSections>

You should recompile the program to version 4 (if you have the source
code) and remove the old version of "SomeApplication.config"

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https://bugs.launchpad.net/bugs/884035

Title:
  Unable to execute .NET programs compiled against the v2.0 runtime:
  "Missing method System.Type::op_Inequality(Type,Type) in assembly
  /usr/lib/mono/2.0/mscorlib.dll"

Status in “gtk-sharp2” package in Ubuntu:
  Confirmed

Bug description:
  If you try to execute a .NET program not compiled against Mono 4.0
  (but compiled against Mono 2.0 instead), when you try to run it you
  get many exception messages relative to missing methods, such as
  "Missing method System.Type::op_Inequality(Type,Type) in assembly
  /usr/lib/mono/2.0/mscorlib.dll".

  More details here:
  <http://orangesquash.org.uk/~laney/blog/posts/2011/10/mono-gotcha/>

  Temporary workaround:
  Run the application passing the "--runtime=v4.0" switch to Mono, like this:
  mono --runtime=v4.0 /usr/lib/myapp/myapp.exe
  (where "/usr/lib/myapp/myapp.exe" is the complete path to the program you are trying to execute) to force Mono to use the v4.0 runtime.
  -----
  This is a sample scenario (running WepCrack):
  luis at ubuntu:~$ sudo su
  [sudo] password for luis:
  root at ubuntu:/home/luis# cd Escritorio/WepCrack
  root at ubuntu:/home/luis/Escritorio/WepCrack# sudo ./wepcrack
  Missing method System.Type::op_Inequality(Type,Type) in assembly /usr/lib/mono/2.0/mscorlib.dll, referenced in assembly /usr/lib/mono/gac/gtk-sharp/2.12.0.0__35e10195dab3c99f/gtk-sharp.dll

  Unhandled Exception: System.MissingMethodException: Method not found: 'System.Type.op_Inequality'.
    at WepCrackGtk.MainWindow..ctor () [0x00000] in <filename unknown>:0
    at GWepCrackGui.MainClass.Main (System.String[] args) [0x00000] in <filename unknown>:0
  [ERROR] FATAL UNHANDLED EXCEPTION: System.MissingMethodException: Method not found: 'System.Type.op_Inequality'.
    at WepCrackGtk.MainWindow..ctor () [0x00000] in <filename unknown>:0
    at GWepCrackGui.MainClass.Main (System.String[] args) [0x00000] in <filename unknown>:0
  root at ubuntu:/home/luis/Escritorio/WepCrack#

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-terminal 3.0.1-0ubuntu3
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  Date: Sun Oct 30 21:28:04 2011
  ExecutablePath: /usr/bin/gnome-terminal
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  SourcePackage: gnome-terminal
  UpgradeStatus: Upgraded to oneiric on 2011-10-24 (6 days ago)

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