(>=0.40 beta 11) Easy GNU/Linux Boot Fix.

(>=0.41 beta 1) Reinstall Microsoft Windows EFI.

(>=0.41 beta 1) Hide Microsoft Windows UEFI.

(>=0.41 beta 1) Fake Microsoft Windows UEFI.

(>=0.41 beta 1) Create a new UEFI Boot entry.

If your computer has UEFI firmware, you can select among the UEFI boot options. If your hard disk has the MBR partitioning format, you can select the Restore Windows MBR (BETA) option to repair the Windows bootloader. Rescatux has a graphical interface with a menu of operating system rescue tasks.

Rescatux is a free bootable live CD/USB that can repair GRUB and the Windows bootloader. If you're unable to select the Repair Windows boot files option because it's grayed out, refer to this answer. The partition on which Ubuntu is installed can be identified from the Disks application which is built-in in Ubuntu. The boot flag should be placed on the same partition on which Ubuntu is installed. Open the Boot Repair application and select Advanced Options -> Other Options tab -> Repair Windows boot files. Dual-boot boot menu does not show up after installing Ubuntu 15.10 alongside Windows 10įrom Ubuntu open the terminal and type: sudo add-apt-repository ppa:yannubuntu/boot-repair.

How to get to the GRUB menu at boot-time?.If this doesn't work when the GRUB menu does not appear at boot time, then try the answers to: Sometimes the manufacturer's splash screen is a part of the Windows bootloader, so when you power up the machine it goes straight to the GNU GRUB menu screen, and then pressing Shift is unnecessary. With UEFI press (perhaps several times) the Esc key to get to the GNU GRUB menu screen. If this doesn't work when the GRUB menu does not appear at boot time, immediately after the motherboard / computer manufacturer logo splash screen appears when the computer is booting, with BIOS, quickly press and hold the Shift key, which will bring up a GNU GRUB menu screen. If there's not one, or if the screen goes by too fast to see it, check your manufacturer's website. During startup, there's often a screen that mentions the key.

On tablets, common buttons are Volume up or Volume down. Common keys used are Esc, Delete, F1, F2, F10, F11, or F12. If the computer boots into Ubuntu automatically without showing the GRUB menu at all, sometimes you can press the manufacturer's BIOS/UEFI key at boot time and while in UEFI or BIOS mode from the firmware menus select the operating system you need.

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