Running entity framework and asp.net on ubuntu

I'm currently working on some ASP.NET app. Everything works fine until i want to use entity framework. I've installed entity framework package via NuGet package manager but i couldn't enable migrations. It shows me that there is no suitable projects found like that: 

I've searched alot in different forums but i couldn't find solution. I've, also tried to install various packages for entity framework but unsuccessfully. Here is the errors that promps when i try to install some of packages: 
 and 
 I'm new in .NET programming and i'm not sure that is possible to develop C# and ASP.NET on ubuntu. I really would like to avoid installing Windows and Visual Studio. Is there any way to solve this problem? Is it possible to develop C# and ASP.NET apps on ubuntu. If it is, what i need to install to solve this problem. Thanks in advance.

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