how to move to uefi
 

Hi all

I have a dual boot (ubuntu + debian) system and now I want to modify it to use uefi. (because actually I have a win10 too, which is now using uefi).
Is there any "official" or practical way to do that?
All of the important data is located on another disk(s), so reinstall is not a problem.

Thanks

Do this as root
mount <efi partition>/boot/efi
will get error about no efivars varibles
create a /etc/fstab to mount the efi partition to /boot/efi

If you have an iso you can boot in efi mode, chroot into your system to do this, you can skip the rest of this and won't get the efivars error. I think boot-repair has an option to convert over also.

reboot, use the bios boot options to select ubunut/debian efi boot option
It it boots, rerun or use efibootmgr to create an entry in the firmware and make default.

thanks
That was not that simple, because
0. switch off windows secure boot
1. move from MBR to GPT
2. resize partitions
3. create and boot a live ubuntu image
4. make a chrooted environment for the original ubuntu
5. grub-install
6. reboot

anyway, what you posted was enough to start and complete it.
Thanks