How to dual-boot Windows 10 and Ubuntu on Sony Vaio?

Question

Windows

I have a Sony Vaio SVE1112M1RW netbook, preinstalled with Windows 8, updated to 10 (UEFI). I wanted to put Ubuntu 15.04 next to it. I broke the disk, installed it, everything is fine until I boot into Windows. If you work only with Ubuntu - at boot, the GRUB bootloader window appears, from which this or that system is correctly selected. After booting into Windows - GRUB seems to be overwritten and on subsequent reboots only Windows is loaded. If I boot from live-usb and execute boot-repair, then GRUB is restored and works until I boot into Windows. Actually a question - how it can be overcome?

Answer 1

I decided myself in the following (rather prosaic) way.
Booted into Ubuntu Live CD, downloaded and ran Boot Repair:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair && (boot-repair &)

After starting, I clicked "Advanced options" and checked the box "Rewrite system efi files" or something like that. Rebooted - everything works.