Re: Booting impossible

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On Tue, 25 Jun 2019 21:59:27 +0200
"Patrick Dupre" <pdupre@xxxxxxx> wrote:

> Hello,
> 
> Thank for your suggestions.
> Here is the current situation.
> After I installed the 2nd boot system on sda6 with a /boo/efi on the
> sdb1 (the 2 systems could mount the same /boot/efi), I have never
> been able to boot on the original system.

This accords with my understanding: there is no chainloading of efi
systems.  A single /boot/efi boots a single OS instance.

> I have a grub2-mkconfig to generate a grub.cfg which has never work
> properly to boot the 1st OS (which has originally installed in fedora
> 28, actually, I noted large differences between the fedora 28 and
> fedora 30 grub.cfg files). Then, I made a grub2-install -o /dev/sda.
> This created a "mess", I only got a grub shell.
> Fortunately, I have a mbr saved for sda and I reinstalled the default
> mbr, and I also had a /boot/efi saved. Hence, I reinstalled the old
> /boot/efi.

So, you updated a bios F28 to efi F30?  I don't know how well that is
supported, but it sounds like a recipe for trouble.

> Lucky, I was able to boot on my "old" system.
> I booted 2 times and then I run
> grub2-mkconfig /boot/efi/fedora/grub.cfg because I wanted to be able
> to have the option of booting of 2 systems. But, then, no way to
> reboot, any of the systems. I tried tons of times from the bios
> configuration. No way. I tried to boot by using the "old" (the one
> which has working for the last boot) grub.cfg, and the new one, but
> same result. In the best situation, I could read something like:
> error file /EFI/x64_86-efi/increment.mod not incremented.
> (it was fast that it was hard to read).
> 
> I do not understand, because I have 2 other machines with 2 or 3
> boots (with 1 or 3 disks, one in efi and one is legacy) in fedora 30
> and I cannot complain.

But on those other systems are you trying to boot a second efi OS from
the first /boot/efi system?  On my efi install, when I run
grub2-mkconfig, it finds all the bios installations and creates menu
entries for them, so I can boot them from the efi system.

I will be installing a second efi system on a different disk, so I will
be able to test how this works with two efi systems in a setup similar
to yours.  I just don't think I will be able to boot the second efi
install from the first, and vice versa.

> I just see one difference for this one: it has 2 disks,
> the ssd in mounted in sdb (with the /boot/efi in sdb1) with one
> system on sdb, and the second (new) system in sda (sda6).
> I just do not understand why it is so much a problem.
> Now, what to do?
> It seems that I am stuck with the bios!
> options
> 1) destroy the sda6? and try to boot !!!
> 2) boot on the stick and make a chroot?
> and fix what has to be fixed? But I have no idea.
> 3) Reinstall the sda6, but then how to have the 2 systems running?
> Why I would be more successful the 2nd time?
> 4) Other options?

I think you should create the EFI partitions on /dev/sda, EF00 (2MB),
EF01 (2MB), EF02 (1GB), and then reinstall the OS on /dev/sda putting
the /boot/efi in the newly created EF02 partition on /dev/sda.  That
will get you a working efi install of F30.  From there you can clean up
the F28-F30 upgrade to ensure that it too can boot efi.  But I don't
think you can expect to boot either of the efi installs from the
other.  You will have to select the non-default efi install from the
firmware boot menu.
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