[MonoDevelop] The errors of building the monodevelop

[Kaleyroy]

Hello, can you help me to check the errors and teach me how to fix them?
i trying to install the monodevelop on ubuntu 12.04,this is my first time
to do that.
and i don't know how to handle this, i want to work on ubuntu by using c#.

thank you^_^

Errors:

/home/kaleyroy/Downloads/monodevelop/main/Main.sln (default targets) ->
(Build target) ->
/home/kaleyroy/Downloads/monodevelop/main/external/debugger-libs/Mono.Debugging.Soft/Mono.Debugging.Soft.csproj
(default targets) ->
/usr/lib/mono/4.0/Microsoft.CSharp.targets (CoreCompile target) ->

SoftDebuggerSession.cs(58,45): error CS0433: The imported type
`Mono.CompilerServices.SymbolWriter.MonoSymbolFile' is defined multiple
times

/home/kaleyroy/Downloads/monodevelop/main/Main.sln (default targets) ->
(Build target) ->
/home/kaleyroy/Downloads/monodevelop/main/external/nrefactory/ICSharpCode.NRefactory.Tests/ICSharpCode.NRefactory.Tests.csproj
(default targets) ->
/usr/lib/mono/4.0/Microsoft.CSharp.targets (CoreCompile target) ->

TypeSystem/TypeSystemTests.TestCase.cs(400,63): error CS0539:
`ICSharpCode.NRefactory.TypeSystem.TestCase.IExplicitImplementationTests.E'
in explicit interface declaration is not a member of interface

 13 Warning(s)
 2 Error(s)
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