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. 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. 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. 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? Thank for your help. =========================================================================== Patrick DUPRÉ | | email: pdupre@xxxxxxx Laboratoire interdisciplinaire Carnot de Bourgogne 9 Avenue Alain Savary, BP 47870, 21078 DIJON Cedex FRANCE Tel: +33 (0)380395988 =========================================================================== > Sent: Tuesday, June 25, 2019 at 2:52 PM > From: "stan via users" <users@xxxxxxxxxxxxxxxxxxxxxxx> > To: users@xxxxxxxxxxxxxxxxxxxxxxx > Cc: stan <upaitag@xxxxxxxx> > Subject: Re: Booting impossible > > On Tue, 25 Jun 2019 11:23:49 -0700 > stan <upaitag@xxxxxxxx> wrote: > > > working. My understanding is that there can be only one > > default uefi /boot/efi. > > To clarify, there can only be one fedora bootable from each /boot/efi. > A single version of any other OS can also be booted from the > same /boot/efi. So you could have fedora, suse, ubuntu, debian, > windows, etc. installed, and they could all be selected and boot from > that same /boot/efi, but not a second version of any of them. > > Kind of clumsy, and makes it hard to run a backup version of Fedora > other than by putting it on a different disk, and booting from the > firmware selection menu. i.e. hitting F2 or Delete during boot. > _______________________________________________ > users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx > Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx > _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
