Hosting asp.net on linux

I am trying to host asp.net on Linux machine.

I updated mono framework..nginx..

When I " DNU restore "it ...I am getting the following error

""

unable to locate dependency kestrel  >= 1.0.0-rc1-update2

unable to locate dependency  Microsoft.AspNet.Diagnostics   >= 1.0.0-rc1-update2

unable to locate dependency Microsoft.AspNet.Hosting   >= 1.0.0-rc1-update2

unable to locate dependency Microsoft.AspNet.Server.WebListener   >= 1.0.0-rc1-update2

unable to locate dependency Microsoft.AspNet.StaticFiles   >= 1.0.0-rc1-update2

""

how to resolve this ??