I have just installed Debian 10 (Buster). I have come to the conclusion that UEFI does not work on my device (despite it being in the firmware setup). For some reason, the install has converted the old MBR/DOS partition table into GPT. And now it dose not boot.
I would like to ether convert it back. Or keep GPT, but convert boot loader to use old method, maybe using protective MBR https://en.wikipedia.org/wiki/GUID_Partition_Table#Hybrid_MBR_(LBA_0_+_GPT) . I have tried to re-install
grub using the installer rescue mode, but this fails ( see new Debian install will not boot if you want more detail on this ).
So how do I make it bootable using MBR, without reinstalling whole OS (and /home)?
I am booted into gparted live.
fdisk -l /dev/sda shows
- Partition table type (Disklabel type): gpt
- root partition type: EFI System
- 4 blocks free at end of disk (for 2nd copy of gpt)
fdisk -t mbr -l /dev/sda shows
- The whole disk reserved for GPT (protective MBR)