yarn dependency, nodejs, is removed during installation of yarn, and vice versa?

Question

Trying to install a package with yarn, but I get and error saying I need nodejs, but installing nodejs removes yarn. Likewise, when I install yarn, nodejs is removed. What am I missing?

$ yarn install some-package
Yarn requires Node.js 4.0 or higher to be installed.

$ curl -sL https://deb.nodesource.com/setup_7.x | sudo -E bash -
...
...
$ sudo apt-get install -y nodejs
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gyp libc-ares-dev libjs-node-uuid libv8-3.14-dev
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  yarn
The following NEW packages will be installed:
  nodejs
...

$ sudo apt-get install yarn
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  gyp libc-ares-dev libjs-node-uuid libv8-3.14-dev
Use 'apt-get autoremove' to remove them.
The following packages will be REMOVED:
  nodejs
The following NEW packages will be installed:
  yarn
...

Answer 1

I ran into this issue while attempting to install Yarn and NodeJS on WSL. Here are the steps I took to get it working:

apt-get remove node
apt-get remove yarn

curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
sudo apt-get install -y nodejs

curl -sL 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