Linux Ubuntu 18.04.2 LTS - Install OpenJDK

Here's a video I made about the installation:
https://www.youtube.com/watch?v=Ow40souEW1s

1: sudo add-apt-repository ppa:openjdk-r/ppa

2: sudo apt-get install openjdk-8-jdk

3: sudo update-alternatives --config java

   On the left there are a couple of numbers.
   Look at the number next to the row where it says "/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java"
   Type that number and press Enter

4: sudo nano /etc/environment

   Add text below on a new row.

   JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java"

   Then save and exit. Ctrl + O and press Enter. Then Ctrl + X

5: source /etc/environment

6: echo $JAVA_HOME

7: java -version

For Minecraft users:
If the game doesn't start, try this:

Go to Launch Options
Activate advanced settings at the top
Click on the profile you want to edit
Activate Java executable
In the text box next to it, paste this in:
/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java