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Here is THE Rescue Disk that you should keep close to your computer !runs automatically Boot-Repair rescue tool at start-up also contains the OS-Uninstaller and Boot-Info tools. repairs recent (UEFI) computers as well as old PCs. Boot-Repair is a simple tool to repair frequent boot issues you may encounter in Ubuntu like when you can't boot Ubuntu after installing Windows or another Linux distribution, or when you can't boot Windows after installing Ubuntu, or when GRUB is not displayed anymore, some upgrade breaks GRUB, etc.

Boot-Repair lets you fix these issues with a simple click, which (generally reinstalls GRUB and) restores access to the operating systems you had installed before the issue.


HOW TO GET AND USE THE DISK:
(1) DOWNLOAD BOOT-REPAIR-DISK,
(2) Then burn it on a live-USB key via Rufus or Unetbootin. (do not burn it on CD/DVD if your PC came with Windows8)
(3) Insert the Boot-Repair-Disk and reboot the PC,
(4) Choose your language,
(5) Connect internet if possible
(6) Click "Recommended repair"
(7) Reboot the pc --> solves the majority of bootsector/GRUB/MBR problems