How can I install boot-manager to ubuntu 12.04? I have tried sudo apt-get install boot-manager but it does not work. Why I want is because I will close some startup application in order to optimize.

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Package manager installs are only supported on the x64 architecture. Other architectures, such as ARM, must manually install the .NET Core SDK or manually install the .NET Core Runtime. For more information, see .NET Core dependencies and requirements.

This article describes how to use a package manager to install .NET Core on Ubuntu 18.04.

Install the SDK (which includes the runtime) if you want to develop .NET Core apps. Or, if you only need to run apps, install the runtime. If you're installing the runtime, we suggest you install the ASP.NET Core runtime, as it includes both .NET Core and ASP.NET Core runtimes.

If you've already installed the SDK or runtime, use the dotnet --list-sdks and dotnet --list-runtimes commands to see which versions are installed. For more information, see How to check that .NET Core is already installed.

Add Microsoft repository key and feed

Before installing .NET, you'll need to:

• Add the Microsoft package signing key to the list of trusted keys.
• Add the repository to the package manager.
• Install required dependencies.

This only needs to be done once per machine.

Open a terminal and run the following commands.

Install the .NET Core SDK

Update the products available for installation, then install the .NET Core SDK. In your terminal, run the following commands.

Important

If you receive an error message similar to Unable to locate package dotnet-sdk-3.1, see the Troubleshoot the package manager section.

Install the ASP.NET Core runtime

Update the products available for installation, then install the ASP.NET Core runtime. In your terminal, run the following commands.

Important

If you receive an error message similar to Unable to locate package aspnetcore-runtime-3.1, see the Troubleshoot the package manager section.

Install the .NET Core runtime

Update the products available for installation, then install the .NET Core runtime. In your terminal, run the following commands.

Important

If you receive an error message similar to Unable to locate package dotnet-runtime-3.1, see the Troubleshoot the package manager section.

How to install other versions

The packages added to the package manager feeds are named in a hackable format: {product}-{type}-{version}.

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• product
  The type of .NET product to install. Valid options are:

  • dotnet
  • aspnetcore

• type
  Chooses the SDK or the runtime. Valid options are:

  • sdk
  • runtime

• version
  The version of the SDK or runtime to install. This article will always give the instructions for the latest supported version. Valid options are any released version, such as:

  • 3.1
  • 3.0
  • 2.1

  It's possible the SDK/runtime you're trying to download is not available for your Linux distribution. For a list of supported distributions, see .NET Core dependencies and requirements.

Examples

• Install the ASP.NET Core 3.1 runtime: aspnetcore-runtime-3.1
• Install the .NET Core 2.1 runtime: dotnet-runtime-2.1
• Install the .NET Core 3.1 SDK: dotnet-sdk-3.1

Package missing

If the package-version combination doesn't work, it's not available. For example, there isn't an ASP.NET Core SDK, the SDK components are included with the .NET Core SDK. The value aspnetcore-sdk-2.2 is incorrect and should be dotnet-sdk-2.2. For a list of Linux distributions supported by .NET Core, see .NET Core dependencies and requirements.

Troubleshoot the package manager

This section provides information on common errors you may get while using the package manager to install .NET Core.

Unable to locate

If you receive an error message similar to Unable to locate package {the .NET Core package}, run the following commands.

If that doesn't work, you can run a manual install with the following commands.

Failed to fetch

While installing the .NET Core package, you may see an error similar to Failed to fetch .. File has unexpected size .. Mirror sync in progress?. Generally speaking, this error means that the package feed for .NET Core is being upgraded with newer package versions, and that you should try again later. During an upgrade, the package feed should not be unavailable for more than 30 minutes. If you continually receive this error for more than 30 minutes, please file an issue at https://github.com/dotnet/core/issues.

Introduction

Node.js is an open-source cross-platform JavaScript (JS) runtime environment. It is used for building fast and scalable network applications. In addition to offering various JS modules, it is also lightweight, efficient and supports consistent and integrated development.

Node Package Manager (NPM) is Node’s official package manager, used for installing and managing package dependencies.

In this tutorial, learn three (3) different options for installing Node.js and NPM on Ubuntu 18.04.

Note: Updating Node.js is a similar process to installing it, but there are minor differences. To find out more, read How to Update Node.js on Linux.

Prerequisites

• Ubuntu 18.04 Bionic Beaver
• A user with sudo privileges. Read this to create a sudo user on Ubuntu
• Access to a terminal/command line

3 Ways to Install NPM (Node Package Manager) on Ubuntu

The easiest way to install Node.js and NPM is from the Ubuntu repository.

First, update the cache repository to ensure you install the latest versions of Node.js and NPM.

1. Type the command:

2. Then, install Node.js with the command:

3. Confirm that the installation was successful by checking the available version:

4. Install the Node.js package manager (npm):

5. Verify the installed version:

Another way to install Node.js and NPM is with the Node Version Manager (NVM). NVM is a tool practical for managing multiple Node.js versions.

1. To install NVM, download the installation script from GitHub. For that, you will use the curl command line.

If you do not have curl, install it by running:

Press y to confirm the installation and hit Enter.

2. Now, download the NVM installation script with the command:

After it automatically clones the NVM repository and adds the NVM path to ZSH or Bash, you will receive the following output:

3. To enable nvm:

• Close and open the terminal or
• Run the given command

4. Finally, check whether the installation was successful by verifying nvm version:

Once you have installed nvm, you can find a list of all the available Node.js versions with the command:

This will list all available versions of nvm, including the latest LTS version, like in the image below:

Note: LTS stands for long-term support and is used for software that is maintained for an extended period and is recommended as being the most stable.

Nvm is a package manager; it can install and manage multiple Node.js versions.

To install a particular version, use the command: nvm install and add the number of the version.

For example for: nvm install 10.15.2

To view all installed versions on your manager, use the command:

This will list all installed Node.js versions as well as the default and stable versions.

To check which version you are currently using, run the command:

To switch versions of Node.js (if you have already installed it on the NVM) enter the command:

Alternatively, you may want to install Node.js and NPM from the NodeSource repository by adding its PPA (Personal Package Archive) for Ubuntu.

To enable the NodeSource repository, you have to use a curl command.

1. If you do not have curl on your system, run the following command to install it:

Press y to confirm the installation and hit Enter.

2. Now use the following sudo bash script to enable NodeSource:

3. Next, install both Node.js and NPM with one command:

4. Verify the installation by checking the versions of Node.js and NPM.

Run the commands:

Note: When installing NodeSource, it is necessary to specify which version of Node.js you will install. In the example above, the Node.js version is 10, but versions 11, 8, and 6 are also available.

Installing Development Tools

Once you have Node.js and NPM setup, install the development tools. This automation tool kit allows compiling and installing native add-ons from the NPM.

To install development tools run the command:

To remove a specific version of Node.js, run the nvm uninstall command appended by the version number.

For example, to uninstall version 8.11.1 run the command:

To uninstall Node.js, but keep its configuration files, type:

To uninstall Node.js and remove any of its configuration files, use the command:

In this tutorial, you learned how to install Node.js and NPM on Ubuntu. We also covered how to remove or uninstall Node.js, and how to install development tools.

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