I'm so sorry you are having issues again! I really hope we can help you solve them.
Corsair keyboard? If so, I believe it. Or perhaps the driver isn't being loaded. Do you have another keyboard to plug it to test? Have you tried unplugging your keyboard, and plugging it back in after booted into the system?
You may try:
sudo apt install xserver-xorg-input-all
The in-built keyboard is the one that doesn’t work, and unfortunately I don’t have any external keyboards.
The PC is HP Stream x360 Convertible (11-ag002ne)
The keyboard doesn’t work at all so there is no way for me to type that command
Does it work at the Grub menu or in tty?
Grub menu is the boot menu right? If so then yes
If you enter Recovery Menu, then Drop to prompt, you can enter installation commands.
I’m sorry but how do I enter the recovery menu? I’m still pretty new to Linux
Reboot and when you see the Motherboard splash screen, begin tapping the esc key.
On older systems, it is left shift key.
It is something that may take a couple of tries...
Recovery mode wouldn’t boot so I managed to run the command with a virtual keyboard.
Sadly, nothing happened after I executed it.
Umm... I just now realized you are on LiveUSB. Not installed... Sorry for that.
What type of Computer- year, make and model?
No wonder, I was trying for two hours to boot it 
This is the model:
Ahhh... ok...
What is the output of:
cat /sys/class/dmi/id/chassis_type
(Use copy / paste)
The result is 31
Are you able to pull up Onboard using mouse and app menu?
That is the On Screen Keyboard.
Yes, I can
I was thinking that the system thinks your computer is a tablet and so, disabled the connected keyboard.
Now, I am not sure if this is a good lead or not given you two replies above...
So is there any way to fix this?
I have been researching and looking into it...
Will trying another Linux distro fix the problem by any chance?