Steem Messenger

First I would like to congratulate @therealwolf on his accomplishment. I think it's a great addition to the steem ecosystem.
You can read all about it here: https://steemit.com/utopian-io/@therealwolf/introducing-steem-messenger-beta

The walkthrough

I will try to keep this brief as I am sure most Linux users are fairly savvy. (Not to say it is not newbie friendly.)

I'm assuming you are running Ubuntu or another Debian based distribution (other distributions have different package managers to handle this part). If you have git, build-essential, npm, and nodejs installed if you do skip these steps...
Open your favourite terminal (Yes, it is one of those types of things.)

sudo apt install git build-essential nodejs npm -y

When that finishes, find a good spot to download the git repository

mkdir GitHub
cd GitHub

Now clone the repo

git clone https://github.com/therealwolf42/steemmessenger.git

When that finishes

cd steemmessenger

Now the fun part starts, it is recommended you install it with yarn, yarn should be installed globally and as root. This isn't a necessary step but makes it cleaner on your output and handling of the app. If you choose to skip this step, and afterwards replace yarn with npm (This may be the case if you are not the root user)

sudo npm install -g yarn

Then..

yarn install

npm install

A lot of text will fly by, you may see warnings, they are just that not errors
Then, we build the application for Linux

yarn run build:linux

npm run build:linux

After that is done there will be a couple new folders there. Inside the build folder, there will be a new file called steemmessenger-0.1.0-x86_64.AppImage (This is the actual packaged program in AppImage format, which runs by default on most Linux distributions)

You may start this from the terminal with

./steemmessenger-0.1.0-x86_64.AppImage

and it should ask you if you want to make a shortcut for your apps menu, do this and then you can start it just like any other program on your computer, from the menu etc.

Alternatively, you may open the file with any file manager, just browse to it and double click on it