Ubuntu and the “immortal” grub

Question

Until yesterday on my minipc all works fine,system boot and works. After hibernate I reboot and...the bootloader "refind" disappear and magically appear a grub shell!

So i do..

linux /boot/vmlinuz-4.15
initrd /boot/initramfs-4.15..
boot

And go only to initramfs shell,which said "cannot mount /dev/ on /root/dev.."

I reboot to a ubuntu livecd..

fsck -c /dev/mmcblkp1
fsck -c /dev/mmcblkp2

Give no error.

I make a chroot(of course mounting dev,proc,sys,with bind) reinstall refind with

refind-install --usedefault /dev/mmblkp1

said to me "no problem",but on reboot...still the grub shell!

I return to ubuntu livecd,destroy and recreate efi partition with the same size,then redo chroot,reinstall refind and.. grub-shell.

What happened?Now I try to reinstall grub and make a grub menu.. but if I want to use refind,why grub still live and even with dd=/dev/zero on efi partition cannot remove?

System is: ubuntu is: 17.10 grub is: efi,boot mode is UEFI

Answer 1

Probably I found the solutions: the system had two "boot partition"

dev/mmcblk1boot0
dev/mmcblk1boot1

For overwrite them I need

echo 0 >  /sys/block/mmcblk1boot0/force_ro

And then try to reinstall refind

Another solution is: reinstall ubuntu and then recover from backup