I was planning on just marking @Bernard's answer as correct when it started working, but then I wanted to go one step further and show y'all the steps I did to fix it while still using GDM3.

The first thing I did was undo all of my previous attempts including the Nvidia driver, and I noticed that without the Nvidia driver it did shutdown properly somehow. The odd part is, later on I figured out that secure boot was preventing Nvidia's driver to even enable so I'm not sure what happened on that front.

After this realization, I properly loaded in Nvidia's driver and reached the same issue Bernard probably experienced.

On shutdown I received a warning saying "Failed to connect to lvmetad", which cancelled the shutdown and looped to the login screen.

After some Googling I came across this post on linuxquestions.org which told me the following step.

Originally Posted by AwesomeMachine View Post
Try first to disable lvmetad from /etc/lvm/lvm.conf and set use_lvmetad = 0. Use a live CD if you have to.

This allowed me to shutdown normally, but there is still a message on startup which I will deal with in the future.

The reason I made this post, is due to my experience with the hassle regarding Nvidia drivers and Ubuntu, I want to make it easier for the next person who comes around, hopefully this helps.

Thank you again Bernard for pointing me in the right direction

Edit: Solved the lvmetad error showing on startup by running

sudo update-initramfs -k KERNEL_VERSION -u ; sync

after changing the value in the config. Ps: replace KERNAL_VERSION with your kernal version