Cfrgtkky

I just wanted to install npm via terminal and now I am just stuck with some dependencies.

It wants me to install a few dependencies, for example:

libssl1.0-dev

nodejs-dev

node-gyp

Even if I try to install these first, it tells me I need the predecessor before.

Last instance of dependency is libssl-dev and this seems already installed.

Target is to install npm for making this electron fork run on my system.

Thanks for you help.

Note: This answer has been updated since when it was first posted because there is now a better way of installing the latest version of npm which is built-in with the node snap package for installing Node.js. After running the below commands running npm -v will show that the latest version of npm is installed and being used.

Node.js is available as a snap package in all currently supported versions of Ubuntu. Specific to Node.js, developers can choose from one of the currently supported releases and get regular automatic updates directly from NodeSource. Node.js versions 6, 8, 9, 10, 11 and 12 are currently available, with the Snap Store being updated within hours, or minutes of a Node.js release.

Node can be installed with a single command, for example:

sudo snap install node --classic --channel 11/stable # also install snapd in 14.04 

The node snap can be accessed by the command node, for example:

$ node -v  

v11.5.0

An up-to-date version of npm will installed as part of the node snap. npm should be run outside of the node repl, in your normal shell. After installing the node snap run the following command to enable npm update checking:

sudo chown -R $USER:$(id -gn $USER) /home/your-username/.config

Replace your-username in the above command with your own username. Then run npm -v to check if the version of npm is up-to-date. As an example I checked that npm was up-to-date, checked the version of an already installed package named yarn with the command npm list yarn and then updated the existing yarn package to the latest version with the command npm update yarn

Users can switch between versions of Node.js at any time without needing to involve additional tools like nvm (Node Version Manager), for example:

sudo snap refresh node --channel=10/stable

Users can test bleeding-edge versions of Node.js that can be installed from the latest edge channel which is currently tracking Node.js version 12 by switching with:

sudo snap switch node --edge

This approach is only recommended for those users who are willing to participate in testing and bug reporting upstream.

Node.js LTS Schedule

Release LTS Status  Codename    LTS Start       Maintenance Start Maintenance End

6.x     Active      Boron       2016-10-18      April 2018        April 2019

7.x     No LTS              

8.x     Active      Carbon      2017-10-31      April 2019        December 2019

9.x     No LTS              

10.x    Active      Dubnium     October 2018    April 2020        April 2021  

11.x    No LTS                                  2019-04-01        2019-06-30

12.x    No LTS                  2019-10-22      2021-04-01        2022-04-01

I had the same issue. libssl is troublesome since lots of packages want different versions of it. The top troublemakers for me are Spotify, Viber, DotNet Core, php5.6 (legacy system).

Anyway, this solution seems to have worked:

Based on the answer by Jonathan Leaders, if you look at the script that it's downloading, you'll see it mention 2 key points: the repository, and the key.

For some reason after running just those commands, nodejs was still referring to the one in the official Ubuntu repositories, and it was an old version, with conflicting requirements for libssl.

Add them manually for reliable results (as root):

echo 'deb https://deb.nodesource.com/node_9.x artful main' > /etc/apt/sources.list.d/nodesource.list

curl -s https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -

After that, simply apt-get update and then apt-get install nodejs

After that you'll have npm as well without installing anything additionally.

Note that this installs Nodejs 9.0, but I'm sure that the same method works for other versions as well. You just have to switch the version number in the repository source in /etc/apt/sources.list.d/nodesource.list

First see what version number is latest here:
https://github.com/nodesource/distributions/tree/master/deb

In our case it is setup_9.x

sudo apt-get install python-software-properties curl

curl -sL https://deb.nodesource.com/setup_9.x | sudo -E bash -

sudo apt-get install nodejs

Prove it is now installed

npm -v

Source: https://tecadmin.net/install-latest-nodejs-npm-on-ubuntu/

Edit: Added 'curl' to initial dependencies.

n-install

Node and npm installed with one line of bash.

Installation of n, the Node.js version manager, on Unix-like platforms, without needing to install Node.js first.
Additionally, installs scripts n-update for later on-demand updating of n, and n-uninstall for uninstalling.

The simplest case is installation of n with confirmation prompt, with subsequent installation of the latest LTS Node.js version:

curl -L https://git.io/n-install | bash

This is by far the simplest way to get started with both n and Node.js - even if you're looking to install only the latest LTS (long-term support) Node.js version, with no (immediate) plans to install multiple versions. The best part is that you can update the node version on the fly. It's got to be my favorite node tool. NVM is similar, but n is my preference.

Also, you can use NVM. Which is a Node Version Manager that allows switching beetween diferent Node versions in a very simple way.
Just run the following commands:

curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash

command -v nvm

Then, reopen your terminal and execute:

nvm install lts/*

That will download Nodejs source code and make installation for you.

Also, one of the key benefits of NVM, is the ability to install global packages without using sudo

If you want more information about NVM, check their Github Repo:

https://github.com/creationix/nvm