Setup ASP.NET Core 1.0 debugging on Ubuntu 16.04

24 May 2016 marrrcin asp.net-core , linux , ubuntu , .net-core , debugging , console , vscode

There has been a lot of excitement about running ASP.NET Core 1.0 applications on Linux. Since RC2, Microsoft provided official support for running .NET Core on Ubuntu, however up to the date of writing this post, .NET Core is officially working only on Ubuntu 14.04. What about newest version of this OS? You can easily get it work (with debugging!). Here's the tutorial, how to run and debug ASP.NET Core 1.0 RC2 on Ubuntu 16.04.

Prerequsites

  • Ubuntu 16.04 installed (can be a VM)
  • Visual Studio Code with latest updates installed
  • good will

Installing .NET Core on Ubuntu 16.04 (dotnet)

Run the following commands to add the following repository package sources to your system (taken from the official Microsoft's http://dot.net site, from Linux/Ubuntu section):

sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'

sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893

sudo apt-get update

Now, the original steps requires to run:

sudo apt-get install dotnet-dev-1.0.0-preview1-002702

But... there will be an error:

The following packages have unmet dependencies:
 dotnet-dev-1.0.0-preview1-002702 : Depends: dotnet-sharedframework-microsoft.netcore.app-1.0.0-rc2-3002702 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

So, let's fix it! Trying to install the dependant package dotnet-sharedframework-microsoft.netcore.app will get you next error, saying that this package depends on libicu52 but it is not installable. Really? Head to:

http://packages.ubuntu.com/pl/trusty/amd64/libicu52/download

and download .deb package. Now, go to the download location and install the package by running:

sudo dpkg -i libicu52_52.1-3ubuntu0.4_amd64.deb

Now, you will be able to run the following commands:

sudo apt-get install dotnet-sharedframework-microsoft.netcore.app-1.0.0-rc2-3002702
sudo apt-get install dotnet-dev-1.0.0-preview1-002702

A few moments and...

dotnet --version

...yay! It's installed.

.NET Core running on Ubuntu 16.04

Visual Studio Code ASP.NET Core Debugging on Ubuntu 16.04

Now, when you have dotnet installed, it's time to setup the debugger. If already have a project to debug, that's great. If not - download official samples from ASP.NET github repository (https://github.com/aspnet/cli-samples - remember to run dotnet restore in the project directory afterwards). After setting this up, just open project directory in VS Code.

First of all, you need Visual Studio Code C# extension. To install it, just press Ctrl+E inside VS Code and type:

ext install C#

After sucessful installation, editor will prompt you to restart. And now... another error! It says, that Ubuntu 16.04 is not supported by .NET Core Debugger. Or is it? ;]

To HACK this issue, go back to the terminal, and head to

/etc/

In this directory, there is a lot of files... And here comes the greatness of "everything-is-a-file" Linux philosophy: the /etc/ directory contains the following files:

os-release
lsb-release

Which as you might have guessed - store the information about Ubuntu version. Let's change all of the 16.04 to 14.04 and see what happens!

sudo nano os-release

edit the file, press Ctrl+O [ENTER] to save, Ctrl+X to exit
repeat the same procedure for the next file:

sudo nano lsb-release

I provide you my files if you are uncertain how they should look:

/etc/lsb-release

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"

/etc/os-release

NAME="Ubuntu"
VERSION="14.04 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
UBUNTU_CODENAME=xenial

Go back to Visual Studio Code. Oh my goodness! .NET Core Debugger have installed! VS Code will also prompt you to add debug configuration file, click yes to generate it.

Debugging ASP.NET Core 1.0 on Ubuntu 16.04

The final step. Open debug view in Code and make sure that you have .NET Core Launch (console) selected as debug target.

Launch ASP.NET Core debugger Ubuntu 16.04

Start debugging by pressing F5. Go back to your code, and mark breakpoint somewhere. The ultimate test - open web browser and hit localhost:5000 (or any other port if you have changed it)... drumroll please... Isn't it awesome?

I hope this post helped you to fully setup ASP.NET Core debugging on Ubuntu 16.04. Happy C# coding... on Linux!

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