Instructions on handing interactive ISO Install and where to locate grub.cfg

docs/install/usb-install.md

@@ -34,6 +34,15 @@ Make sure you choose the correct device. The process erases data on the selected
 
 ## Common issues
 
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+Sometimes using a USB to mount the Harvester ISO disk directs you to Grub2. In this case, it helps to know how to set the root partition and where to locate `grub.cfg`.
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+You can see the current root partition in the `grub.cfg`, once you've set the root to be within where the ISO lives on the USB. To view the `grub.cfg` from the ISO, run the command `cat /boot/grub2/grub.cfg`.
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+To set a new root partition, run the command `set root=(hdN,msdos1)`, where N denotes N numbers of possible drives. N should be the drive your USB is mounted to.
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+To launch into the GNU GRUB2 Boot Menu from the ISO, once the root has been set to where the ISO is located at the partition of `msdos1` - you can run `chainloader /boot/grub2/x86_64-efi/grub.efi` to get loaded into the GRUB2 Boot Menu for the Harvester Installer.
 ### When booting from a USB installation flash drive, a `GRUB _` text is displayed, but nothing happens
 
 If you are using the UEFI mode, try to boot from the UEFI boot partition on the USB device rather than the USB device itself. e.g.,