You can also just use a dedicated Boot Repair disc to boot straight to the graphical Boot Repair tool. We have a guide to reinstalling the GRUB2 boot loader on Ubuntu, either with a graphical Boot Repair tool or by using standard Linux terminal commands. Boot into the USB drive and use the the Linux system to repair GRUB. You can use an Ubuntu installation disc or USB drive to do this. If you can’t access GRUB, you’ll need to repair it.
#GRUB ON USB TO BOOT HARD DRIVE HOW TO#
RELATED: How to Repair GRUB2 When Ubuntu Won't Boot In dual-boot situations, you should generally install Linux on a computer after you install Windows. GRUB can also boot Windows for you, so you’ll still be able to boot into Windows after you install GRUB. Windows writes its own boot loader to the boot sector, and you won’t be able to boot Ubuntu until you reinstall GRUB. This can happen if you install Windows on a drive after installing Ubuntu or another Linux distribution on it. If you don’t see a menu with a list of boot options appear, the GRUB boot loader may have been overwritten, preventing Ubuntu from booting. If you see a menu with a list of operating systems appear, you’ve accessed the GRUB boot loader. Boot your computer while holding the Shift key.
The first thing to check is whether you can access the GRUB2 boot loader. RELATED: GRUB2 101: How to Access and Use Your Linux Distribution's Boot Loader Check if You Can Access the GRUB Boot Loader