Solution: (Error)Unable to Correct problems, You have held broken packages–Install .NET Core on Ubuntu

Recently, I have been using Linux(Ubuntu) machine on my virtual box quite a bit and as  Microsoft.NET Developer I want to install .NET Core on Ubuntu. So I tried following the instruction from below link to install .NET core on Ubuntu 16.04.

https://docs.microsoft.com/en-us/dotnet/core/linux-prerequisites?tabs=netcore2x

But I was not unable to install .NET Core and I was getting following errors.

The following packages have unmet dependencies:
  dotnet-sdk-2.1.4 : Depends: dotnet-runtime-2.0.5 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

You can see the same error in the following screenshot.



I was a little bit curious about that and then I have read carefully the documentation mentioned on the above link and I have found that .NET Core require following require following Ubuntu distributions as Prerequisites.

• libunwind8
• liblttng-ust0
• libcurl3
• libssl1.0.0
• libuuid1
• libkrb5-3
• zlib1g
• libicu52 (for 14.X)
• libicu55 (for 16.X)
• libicu57 (for 17.X)

Most of the time it should be installed by default with sudo apt-get update and sudo apt-get upgrade command but sometimes it does not. So what I did install all these distributions one by one via sudo apt-get install command and in my case, I was not having liblttng-ust0 distribution on my machine. So I have installed it via the following command.

sudo apt-get install liblttng-ust0

You can also see below screenshot for the same.



Then I was able to install .NET Core on my machine via following above link on documentation.



And now it’s running .NET Core v 2.1.4 on my Ubuntu VirtualBox as you can see it in below dotnet version command.



I was able to solve my problem this and so I thought it will be a good idea to share it on my blog so it will help people who are having the same problem.

Stay tuned for more there is a lot more coming for asp.net core and node.js on Linux on future blog posts.

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How to install Robo3T(Formerly RobMongo) on Ubuntu

Robo3T formerly known as RobMongo is one of best GUI tools for the managing and querying MongoDB database. I have been using it quite often for creating applications with MongoDB and Node.js. Recently a new version made available but there were no instructions for installing it on Ubuntu. So I thought it would be a great idea to write a blog post about it.

To install it. First, we need to open terminal and download tar.gz file from official site with the following command.

wget https://download.robomongo.org/1.2.1/linux/robo3t-1.2.1-linux-x86_64-3e50a65.tar.gz

Once download will complete we need to extract tar.gz file with following command

tar -xvzf robo3t-1.2.1-linux-x86_64-3e50a65.tar.gz

As now we have extract it into the folder we need to move that under /usr/local/bin directory to make it available for all the users. So todo that we need to first create robo3t directly under /usr/local/bin folder with following command.

sudo mkdir /usr/local/bin/robo3t

Then we need to move all the files of extracted folder into robo3t folder under /usr/local/bin directory with following command.

sudo mv  robo3t-1.2.1-linux-x86_64-3e50a65/* /usr/local/bin/robo3t

Now, We need to give permission to newly created directory with following command.

sudo chmod +x robo3t ./robo3t

Once you are done with it. You are ready to use robo3t. You can run it from command line from usr/local/bin directory via following command.

./robo3t

And it will run the Robo3t like following.



That’s it. Hope you like, Stay tuned for more!!.

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How to install Visual Studio code on Ubuntu

Recently I presented a Webinar on ASP.NET Core on Linux. Here I have displayed how we can use Visual Studio Code a Free Open Source Editor from Microsoft to develop application. One of frequently ask question was How I can install Visual Studio Code on Linux. Since lots of People are using Ubuntu as Development Machine I thought it will be a good idea to write a blog post about how to install Visual Studio code on Linux(Ubuntu Machine).

So first thing we need to do it open a terminal in Ubuntu and then we need to type following command one by one.

curl https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.gpg

Then you need to run the following command to move gpg file download via Curl to etc/apt folder.

sudo mv microsoft.gpg /etc/apt/trusted.gpg.d/microsoft.gpg

Now, You need to run following command.

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

After that, you need to run Apt-get Command to update package cache and Apt-get install command to install visual studio code.

sudo apt-get update
sudo apt-get install code

That’s it. You are done with installing Visual Studio Code. You can find more information about different Linux flavors at following  link on Visual Studio code.

https://code.visualstudio.com/docs/setup/linux

Hope you like it. Stay tuned for more!!

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