Please be sure to include meaningful information that can help troubleshoot.
Snap a photo if needed to catch the error or describe what happened that something "did not work" as best you can.
Vague and very open hints make it very hard to know where to begin.
If I delete the OS I currently have & then reinstall it again via USB drive, what partitions do I have to make on my SSD if it is the ONLY OS installed onto it?
The way I want it - is for my SSD to only have Zorin as it's only OS and installed via USB C port without it having to show any error logins or the Zorin grub menu.
In etc/default/grub is GRUB_TIMEOUT_STYLE set to hidden? GRUB_TIMEOUT_STYLE=hidden
If it is set to hidden and you are still seeing the grub menu, then that means you have a defunct EFI entry in your EFI partition.
You can check with the boot manager. Please run
You are focusing on the X - Y problem. You are focusing on your attempted solution rather than your actual problem .
Please see here:
This answers the question and addresses your actual Problem. You have said that you are not dual booting - yet your Grub Menu shows that you have a Windows OS bootloader. That is the reason that the grub menu is showing up and that is the problem we need to solve.
I see. So you do have Windows installed.
Grub Menu is appearing in order to allow you to choose which to boot. If you remove the grub menu from appearing, how are you going to boot into Windows (on its SSD) when you wish to?
When I first power on my computer, I press F12 which takes me to the list of SSD or USB drive I want to login to, so when I use the Windows drive I click on that SSD which shows no grub menu.
Just so you know, my Zorin SSD is the 1st SSD slot and my Windows SSD in the 2nd slot.
Fair enough. You can do it that way. We run into a second issue, though: if you remove the Grub Menu, then you will lose access to the Recovery Menu if you need to perform a recovery on Zorin OS.
It is a case of shooting oneself in the foot in order to shave a few seconds off boot time. It is not worth it. The choice is yours, however...
sudo nano /etc/default/grub
Set GRUB_TIMEOUT=10 to 0
Warning:
As stated above, setting the grub timeout to Zero Seconds will often remove access to the essential Recovery Menu. I Do Not recommend this action.
Once you have GRUB_TIMEOUT=0 set, tap ctrl+o, then the enter key to save and save as current configuration.
Then tap ctrl+x to exit the editor.
In terminal, you must now run: