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I've installed Windows 8.1 after Ubuntu 15. Now there is only one bootable OS and that is Windows 8.1. How can I recover Ubuntu 15 boot loader?

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You can use boot-repair.

  1. Create an Ubuntu LiveCD or LiveUSB
  2. Boot into it.
  3. Install the program boot-repair onto the CD or USB.
  4. Launch Boot Repair and choose the default repair. It should work fine.

(There is also a more complex method available which involves chrooting into your system, but I personally prefer this one.)

This should work. Just ask if you need any more help :)

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To recover Grub (I'm supposing this is the original bootloader)

  • Boot through Fedora DVD or Red Hat DVD of Mandriva , not Ubuntu

  • Select Troubleshooting and then select Rescue installed system option

  • To the question "Do you want to start the networking" say no.

Once you get to the shell enter the following three commands:

  1. $chroot /mnt/sysimage

  2. $cd /boot

  3. $grub-install /dev/sda

And you have your bootloader back ;-)

Taken from http://www.wikihow.com/Restore-Linux-Grub-After-Installing-Windows

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