Update

Since the time this article was published Microsoft has released the official way of installing DotNet Core you can find them in DotNet Ubuntu 18.04 Downloads

With the release of Ubuntu 18.04 the new LTS version of the popular Operating System, people might be eager to try dotnet on the platform.

Sadly, at the time of writing this post, neither the page getting stater page DotNet Get Stated nor the downloads page DotNet Downloads list a compatible package with this OS.

In fact, if you try to install following the instruccions for the closest release which was 17.04 Instructions Ubuntu 17.04 you will get an error of missing dependencies.

In order to install you have to used the following steps as it is indicated in this GitHub issue.

Registering Microsoft keys and feeds

It is necessary to add the keys and the feed to the system so you have to type in a terminal the following commands.

sudo apt-key adv --keyserver packages.microsoft.com --recv-keys EB3E94ADBE1229CF

sudo apt-key adv --keyserver packages.microsoft.com --recv-keys 52E16F86FEE04B979B07E28DB02C46DF417A0893

To add the feed you need to type:

sudo sh -c 'echo "deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-bionic-prod bionic main" > /etc/apt/sources.list.d/dotnetdev.list'

And update the packages list with

sudo apt-get update

Installing DotNet Core

To install dotnet you can use the stable version with:

sudo apt-get install dotnet-sdk-2.1.105 

Or the newest preview version with:

sudo apt install dotnet-sdk-2.1.300-preview2-008533

Remember that you can have both installed side by side, newer dotnet have the dotnet --list-sdks and dotnet --list-runtimes, although the newest will be used if it is not overridden with a global.json file. You can find more info in this Scott Hanselman's post. Also

Testing the installation

Inside a folder create a new console project with:

dotnet new console

To run it, you need to use:

dotnet run

And everything works correctly qou will be able to see a Hello World message on your terminal:

Hello World!