Re: Question about GRUB recovery using Debian 7.x LiveCD
Sorry to Diogene Laerce. I was very confused. And also, my answer
doesn't answer to any question, I fear. anyway:
thanks to this topic I have forced myself for trying to fix a trouble
with Grub, and indeed I have done!
well, my old PC had run a Mint 7, together with a winXP and Zenwalk.
Grub was installed on mint; few months ago it suddenly stopped running
and I stopped using my old PC, too.
This morning I launched a live SystemRescueCD 1.1.5 - another quite
old one - and I found out that the problem was of the partition, or
better of any bad superblock in it. So I listed the superblocks of the
partition through TestDisk I could find in the live CD; then I mounted
just that partition while having changed the superblock.
At Last, I ordered to SYstemRescueCD to make a new installation of
grub in the previous partition newly mounted.
So I could boot mint7 and give a $ sudo update-grub.
this way allows to restore a basic grub without any other tool.
n.b. SystemRescue is based on gentoo and shows a root-terminal so I
didn't need to play with sudo. I guess that any other live distro
could run as well.
# mount /dev/sda2 /mnt (where grub is)
# grub-install --root-directory=/mnt /dev/sda
that's all. Thankyou very much for being patient
2015-02-07 18:30 GMT+01:00 Diogene Laerce <me_buss777@yahoo.fr>:
> Hi,
>
> You made a mistake : you sent your message to me and not to the list.
> No harm done. But I am not everybody so maybe you would want to resend
> it. ;)
>
> Kind regards,
> --
> “One original thought is worth a thousand mindless quotings.”
> “Le vrai n'est pas plus sûr que le probable.”
>
> Diogene Laerce
>
>
> On 02/07/2015 06:17 PM, albcares wrote:
>> hallo to everybody!
>> thanks to this topic I have forced myself for trying to fix a trouble
>> with Grub, and indeed I have done!
>> well, my old PC had run a Mint 7, together with a winXP and Zenwalk.
>> Grub was installed on mint; few months ago it suddenly stopped running grub.
>> This morning I launched a live SystemRescueCD 1.1.5 - a quite old one,
>> too - and I found out that the problem was of the partition, or better
>> of any bad superblock in it. So I listed the superblocks of the
>> partition through TestDisk I could find in the live CD; then I mounted
>> just that partition while having changed the superblock.
>> At Last, I ordered to SYstemRescueCD to make a new installation of grub
>> in the previous partition newly mounted.
>> So I could boot mint7 and give a $ sudo update-grub.
>> this way allows to restore a basic grub without any other tool.
>> n.b. SystemRescue is based on gentoo and shows a root-terminal so I
>> didn't need to play with sudo. I guess that any other live distro could
>> run as well.
>>
>> # mount /dev/sda2 /mnt (where grub is)
>> # grub-install --root-directory=/mnt /dev/sda
>>
>> that's all. Thankyou very much for being patient
>>
>> 2015-02-07 17:09 GMT+01:00 Diogene Laerce <me_buss777@yahoo.fr
>> <mailto:me_buss777@yahoo.fr>>:
>>
>>
>> On 02/07/2015 04:31 PM, Bret Busby wrote:
>> > On 07/02/2015, Diogene Laerce <me_buss777@yahoo.fr
>> <mailto:me_buss777@yahoo.fr>> wrote:
>> >> On 02/07/2015 06:32 AM, Bret Busby wrote:
>> >>> Hello.
>> >> Hi,
>> >>
>> >>> [...] Now, the request is this; please advise the stepwise
>> procedure for
>> >>> using a Debian 7.x LiveCD, to (attempt to) restore GRUB, so that the
>> >>> GRUB menu is available and accessible and usable, and, detects the
>> >>> installed operating systems, and offers them as boot options.
>> >> You could give a try to Grub Rescue : http://www.supergrubdisk.org/
>> >>
>> >> Good luck !
>> >>
>> > Hello.
>> >
>> > Thank you for that suggestion.
>> >
>> > At first look, that seems useful for me, for a number of reasons
>> > (including, maybe finding the installed Win8 (nasty thing that it is),
>> > and, eliminating the forgotten passwords, and, resetting the Debian 5
>> > root and user passwords that I have forgotten on a different, very
>> > important computer, so I can maybe update it).
>> >
>> > However, ...
>> >
>> > At
>> > http://www.supergrubdisk.org/
>> > is
>> >
>> > "
>> > I am going to modify Rescatux 0.32 roadmap so that it’s easier to
>> > release Rescatux 0.32 even if it lacks some importants items.
>> >
>> > We drop UEFI Boot Support. This does not mean not being able to fix
>> > grub systems based on UEFI. What it means is that I was going to make
>> > sure that you could boot Rescatux cd in EFI mode without a problem.
>> > You will be able to boot Rescatux cd from a UEFI system if the CD is
>> > booted in legacy boot mode (BIOS) but not as EFI mode. The reason for
>> > dropping this UEFI boot support is because of Debian Live for its
>> > Debian Wheezy version not being good enough for enabling UEFI boot
>> > based on grub2. I also do not want to achieve the same result by using
>> > current SG2D and the Rescatux isolinux image as I did in the old days.
>> > I just want a plain isolinux based ISO image and that’s it. I also do
>> > not want to rebase Rescatux on Debian Jessie even if it’s tempting.
>> > Once we release the stable Rescatux 0.32 we would be able to think
>> > about rebasing Rescatux on Debian Jessie which its Live Build package
>> > will have EFI support based on syslinux / isolinux. Not yet, but I’m
>> > sure that they won’t release Debian Live for Jessie without EFI boot
>> > support because it’s a must nowadays.
>> > "
>> >
>> > So, the question is ... does it work on a GPT/UEFI system? The above
>> > passage, makes trying to use the application, on a GPT'UEFI system,
>> > sound scary, kind of like flying in one of those big jet airliner
>> > things, with the windows open, and without parachutes.
>>
>> Sorry to hear that, I actually never had to deal with a GPT/UEFI system
>> as I just removed the security and installed as a normal one.
>>
>> Anyway the guy does say : "This does not mean not being able to fix
>> grub systems based on UEFI.". So what i'd do in your case is verify
>> if you can effectively boot with UEFI enabled from the sgb disk
>> without issue. Then I guess you could assume that you could fix
>> your boot..
>>
>> And of course, wait for more feedbacks ! :)
>>
>> Kind regards,
>>
>> --
>> “One original thought is worth a thousand mindless quotings.”
>> “Le vrai n'est pas plus sûr que le probable.”
>>
>> Diogene Laerce
>>
>
--
linux user #521635
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