Re: Important packages that are broken ia64

> 
> 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