How to Download ROS on Linux Mint

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Hello,

I'm trying to download ROS on my Linux Mint machine. I have been following the installation guide (while skipping section 1.1 as Linux Mint doesn't have the same Software & Updates program). However, when I excecute sudo apt update, I receive the following errors:

Ign:1 http://packages.linuxmint.com tara InRelease
Hit:2 http://security.ubuntu.com/ubuntu bionic-security InRelease                                                    
Hit:3 http://packages.linuxmint.com tara Release                                                                     
Ign:4 http://packages.ros.org/ros/ubuntu tara InRelease                                                              
Err:5 http://packages.ros.org/ros/ubuntu tara Release                                          
  404  Not Found [IP: 2605:bc80:3010::134 80]
Hit:6 http://archive.ubuntu.com/ubuntu bionic InRelease                  
Hit:7 http://archive.canonical.com/ubuntu bionic InRelease               
Hit:8 http://archive.ubuntu.com/ubuntu bionic-updates InRelease
Hit:10 http://archive.ubuntu.com/ubuntu bionic-backports InRelease
Reading package lists... Done                     
E: The repository 'http://packages.ros.org/ros/ubuntu tara Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

How do I overcome this?

P.S. I have posted the same question on the Linux Mint Forums, but no one has answered over 2 days.