Saturday, March 10, 2018

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.

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 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 core and node.js on Linux on future blog posts.

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.

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.

And it will run the Robo3t like following.


That’s it. Hope you like, Stay tuned for more!!.
Wednesday, March 7, 2018

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 | 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] 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.

Hope you like it. Stay tuned for more!!
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