I also had this problem by promising the client that I could write an ASP.NET 5 WepAPI application and deploy it on my Ubuntu 14.04 server. Hooray.
Basically, you need to update the version before the expiration date to ensure that this feature is properly supported. . On Ubuntu, you can use the official nightly repository. However, note that on Ubuntu you may need to list all installed packages using dpkg and make grep for mono and make sure that you completely clear previous installations (both manually and the package manager). You will have this problem, especially if you installed it from the source.
Again, in the context of Ubuntu, you can use whereis mono to track wherever possible. This must be done because otherwise you will have conflicts, as you will have several versions of the monocompetitions in your ENV.
For OSX and other platforms, you can find official nightly information and links here .
Again, for Ubuntu, here's how to add a binary night clock to your sources:
echo "deb http://download.mono-project.com/repo/debian nightly main" | sudo tee /etc/apt/sources.list.d/mono-nightly.list sudo apt-get update
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