> > Well, you need to install efibootmgr. Not sure why it isn't installed on your > machine in the first place since it's needed for grub-install to update the > boot manager settings in firmware and create the "grub" entry. > > Just install it with: > > # apt install efibootmgr > > Adrian >
Thanks Adrian. It is a mystery why it was previously installed. After that I was able to go through 3 or 4 bisections with successful boots. Then, finally, I hit the problem. The trouble is that it seems to have also affected my “debian” entry, so no safe boot: Loading.: debian Starting: debian Welcome to GRUB! 7 0 0x00006B 0x000000000000001E unexpected trap 7 0 0x000066 0x000000000000001E trap taken, number in ext PE 7 0 0x00003C 0x0000000000005A00 trap taken, offset in ext PE
