How do I change mono to run code made for .NET 4 intead of 2? I'm on Ubuntu Server 11.04

mono --version gives me this:

Mono JIT compiler version 2.6.7 (Debian 2.6.7-5ubuntu3)
Copyright (C) 2002-2010 Novell, Inc and Contributors. www.mono-project.com
        TLS:           __thread
        GC:            Included Boehm (with typed GC and Parallel Mark)
        SIGSEGV:       altstack
        Notifications: epoll
        Architecture:  x86
        Disabled:      none

Supposedly I need to run mono 2.8 or greater. So i ran this script (Ubuntu) and rebooted but it still looks like i have the same version.

Edit #1: When i get an error i see this at the bottom:

Version information: Mono Runtime Version: 2.6.7 (Debian 2.6.7-5ubuntu3); ASP.NET Version: 2.0.50727.1433

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Hello, this question has no information and activity for a very long time. I am voting to close it for now. If by any reason you think this question is still viable or useful in anyways or that there is still a good chance it will be answered please flag it to a moderator or add a comment with the reasons why you want it open. Regards. – nitstorm Feb 29 at 6:35
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closed as too localized by nitstorm, htorque, bodhi.zazen, jrg Mar 2 at 19:29

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