installing Forge/Forge Mobile backport in Ubuntu

Hi,
This is a question for the Linux gurus out there
I'm taking my first steps in the Linux open source world and I'm really liking it!
Installed Ubuntu on a new laptop and learning how to use Ubuntu.
I want to install Forge and Forge Mobile backport on Ubuntu.
Here some questions about the installation:
1) Forge:
I see on Ubuntu there is OpenJDK installed. To my knowledge this is an open source implementation of Oracle's Java
(https://openjdk.java.net/)
Can I run Forge on this Java version or do I need to install Oracle's Java?
2) Forge Mobile backport:
Same question as for Forge.
Additional question: somewhere on the forum I have read there is additional software needed to run the backport.
Because I'm very new to Linux, I don't know how to download and install this additional software.
Can somebody give me a screenshot, link or explanation where to download and install that software (I'm using Ubuntu 18.04 LTS)?
Thanks in advance!
Jessica
This is a question for the Linux gurus out there

I'm taking my first steps in the Linux open source world and I'm really liking it!
Installed Ubuntu on a new laptop and learning how to use Ubuntu.
I want to install Forge and Forge Mobile backport on Ubuntu.
Here some questions about the installation:
1) Forge:
I see on Ubuntu there is OpenJDK installed. To my knowledge this is an open source implementation of Oracle's Java
(https://openjdk.java.net/)
Can I run Forge on this Java version or do I need to install Oracle's Java?
2) Forge Mobile backport:
Same question as for Forge.
Additional question: somewhere on the forum I have read there is additional software needed to run the backport.
Because I'm very new to Linux, I don't know how to download and install this additional software.
Can somebody give me a screenshot, link or explanation where to download and install that software (I'm using Ubuntu 18.04 LTS)?
Thanks in advance!
Jessica