I installed Windows 7 on an SSD and upgraded it to Windows 10. Then I installed Linux mint 17.2 Cinnamon and had the following partitions:
The boot menu was showing Linux Mint and Windows 10 and I thought everything was fine. UEFI boot configuration showed "ubuntu". However after booting Windows and then rebooting, grub was gone, and in boot configuration there was only "Windows Boot Manager" available.
When I repaired grub2 with
grub-update I was able boot Linux Mint again, but only as long as I don't boot into Windows 10, which seems to wipe out grub like this every time.
Secureboot and Fastboot are disabled.
/boot/efi contains folders Boot, Microsoft and ubuntu.
Did I do something wrong? How can I get grub2 working permanently?