Install yarn on ubuntu 16.04?

Question

ubuntu

I just started to learn linux, a problem arose: I'm trying to install the yarn manager, I'm doing it according to the instructions for linux debian / ubuntu. But when checking yarn --version, the terminal writes

Программа 'yarn' на данный момент не установлена. Вы можете установить её, выполнив:
sudo apt install cmdtest

if you run it again sudo apt-get install yarn, it says The newest version of yarn package (1.3.2-1) is already installed,
what am I doing wrong? what does cmdtest have to do with it? plz help me figure it out
UPD sudo apt-get install --reinstall yarn fixed the issue

Answer 1

curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt-get update && sudo apt-get install yarn

something like this, but before installing it is recommended to update NODE to 16.04 or lower.

Answer 2

https://yarnpkg.com/en/docs/install

Answer 3

It is installed via npm, and npm comes with node.js.