fix debian installation

docs/install/debian.md

@@ -7,24 +7,24 @@ parent: Install
 
 ## Debian installation
 
-1. Install Node.js & yarn (**from root**)
+1. Install dependencies
 ```bash
-curl -sL https://deb.nodesource.com/setup_16.x | bash -
-apt-get install -y nodejs
-curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg |  apt-key add -
-echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
-apt-get update && apt-get install yarn
+sudo apt install curl gcc g++ make libpq-dev
+```
+
+
+1. Install Node.js & yarn
+```bash
+curl -sL https://deb.nodesource.com/setup_16.x | sudo bash -
+sudo apt-get install -y nodejs
+sudo npm install -g yarn
 ```
 <small>[source](https://github.com/nodesource/distributions/blob/master/README.md)</small>
 
-1. Install Gancio
-```bash
-yarn global add --silent {{site.url}}/latest.tgz 2> /dev/null
-```
 
 1. Setup with postgreSQL __(optional as you can choose sqlite)__
 ```bash
-apt-get install postgresql
+sudo apt-get install postgresql
 # Create the database
 su postgres -c psql
 postgres=# create database gancio;
@@ -34,18 +34,22 @@ postgres=# grant all privileges on database gancio to gancio;
 
 1. Create a user to run gancio from
 ```bash
-adduser gancio
+sudo adduser gancio
 su gancio
 ```
+1. Install Gancio
+```bash
+yarn global add --silent {{site.url}}/latest.tgz 2> /dev/null
+```
 
 1. Launch interactive setup
 ```bash
-gancio setup --config config.json
+$(yarn global bin)/gancio setup --config config.json
 ```
 
 1. Start
 ```bash
-gancio start --config config.json
+$(yarn global bin)/gancio start --config config.json
 ```
 1. Point your web browser to [http://localhost:13120](http://localhost:13120) or where you selected during setup.
 
@@ -69,7 +73,8 @@ sudo pm2 startup -u gancio
 > Don't be lazy and [backup]({% link install/backup.md %}) your data!
 
 ```bash
-sudo yarn global remove gancio
-sudo yarn global add --silent {{site.url}}/latest.tgz  2> /dev/null
+yarn global remove gancio
+yarn cache clean
+yarn global add --silent {{site.url}}/latest.tgz  2> /dev/null
 sudo service pm2 restart
 ```