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I had one drive with Windows 8.1, Ubuntu 15.10 and Ubuntu 14.04. The windows was installed on different partition.

Then, I connect a SSD drive and install Windows 10 and format the Windows 8.1 partition. I have a USB with Ubuntu installation.

Could anyone tell what should I do in order to get the grub menu back and be able to choose which operating system to start?

gotqn
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    First off, a detailed Canonical answer is NOT required, as this is not Canonical's problem. When you install Windows, Microsoft's bootloader replaces Grub, and completely ignores any non-Windows operating systems. – SuperSluether Jan 09 '16 at 19:05
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    You really should do your research. There's already a solution here: https://askubuntu.com/questions/88384/how-can-i-repair-grub-how-to-get-ubuntu-back-after-installing-windows#88432 – SuperSluether Jan 09 '16 at 19:07
  • Depends if UEFI or BIOS install(s). And all installs need to be in same boot mode. Best to see details. https://help.ubuntu.com/community/Boot-Info – oldfred Jan 09 '16 at 19:47
  • take a look at http://askubuntu.com/questions/457224/failed-to-access-windows-8-1-ntfs-partition-from-ubuntu-13-10-even-after-disabl/457401#457401 . Might help your case.. – raz Jan 16 '16 at 11:54

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Basic procedure that I personally would use

1 Boot the Ubuntu Live CD.

2 Press Ctrl-Alt-F1

3 sudo mount /dev/sda1 /mnt

4 sudo mount --bind /dev /mnt/dev

5 sudo mount --bind /proc /mnt/proc

6 sudo mount --bind /sys /mnt/sys

7 sudo chroot /mnt

8 sudo grub-install /dev/sda1

Sergiy Kolodyazhnyy
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Press Ctrl-Alt-F1 then you need to login as root. Type nano fix.sh and enter

sudo mount /dev/sda1 /mnt1

sudo mount --bind /dev /mnt1/dev

sudo mount --bind /proc /mnt1/proc

sudo mount --bind /sys /mnt1/sys

sudo chroot /mnt1

sudo grub-install /dev/sda1

Then save it and type sh fix.sh

Thomas Wilbur
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