Creating a cold wallet offline without a third-party wallet

There are several third-party (by which I mean, not written by Ripple Inc.) wallets out there, and they are probably trustworthy, but no one knows for sure. This is a short guide for those of us who are a bit paranoid.
It follows on from this guide:
But you don’t need to have a Raspberry Pi, just a Linux PC that you trust. I’m basing this on Ubuntu 16.04. You will need some basic knowledge of using Terminal in Linux.
First, install Node and npm:
https://www.digitalocean.com/community/tutorials/how-to-install-node-js-on-ubuntu-16-04
Quote In order to get this version, we just have to use the apt package manager. We should refresh our local package index first, and then install from the repositories: $ sudo apt-get update $ sudo apt-get install nodejs If the package in the repositories suits your needs, this is all that you need to do to get set up with Node.js. In most cases, you’ll also want to also install npm, which is the Node.js package manager. You can do this by typing: $ sudo apt-get install npm This will allow you to easily install modules and packages to use with Node.js. Because of a conflict with another package, the executable from the Ubuntu repositories is called nodejs instead of node. Keep this in mind as you are running software.
Then follow these instructions from @JoelKatz (thanks, JK!). I suggest you create the cold wallet directory inside an encrypted partition, if you have one.
Once all packages are installed, I recommend you take the computer offline, for good. Then generate the keys.
Remember, if using Ubuntu, at steps 4 & 5 you have to type nodejs in place of node.
Once you are absolutely sure that it is valid and you have the secret key safely stored, you can fund the wallet using an online computer (at least 20 XRP). Then you can check it’s activated by looking at bithomp.com.
(Aside: I also tried the method detailed here but couldn’t get it to work. If anyone can see an error in the method, please point it out.)

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