Re: Question about GRUB recovery using Debian 7.x LiveCD
On 20/02/2015, Bret Busby <bret.busby@gmail.com> wrote:
> On 20/02/2015, Bob Proulx <bob@proulx.com> wrote:
>> Bret Busby wrote:
>>> The Debian 7.60 LXDE LiveCD does not have an option to boot into rescue
>>> mode.
>>
>> You could always download the standard debian-installer and use that
>> to boot rescue mode. It is a very good option.
>>
>> However if you have a livecd and you say you do then that should be
>> enough to do what you need. Simply chroot into your system and then
>> use it to repair your bootloader.
>>
>> The basic process goes like this.
>>
>> * Boot a livecd image.
>> * Mount the target system to repair.
>>
>> mkdir /target
>> mount /dev/sda5 /target
>> mount /dev/sda1 /target/boot
>> chroot /target /bin/bash
>> grub-install /dev/sda
>> exit
>> shutdown -r now
>>
>> You will need to adapt it to your system environment. Your device
>> paths will be uniquely yours. This is just an example of the overall
>> process to give you the idea of the flow. The chroot stacks a shell
>> logged into the target environment. Once inside that environment then
>> you have access to the system commands to repair grub. You can
>> apt-get install additional software. You can fix things.
>>
>> Bob
>>
>
> Hello.
>
> I had found a LiveCD rescue iso, and had tried to load that, in case
> that would take me to a "restore grub" menu option, but that booted
> into a command line, that showed that fdisk was not available, and
> chroot was not available, so I tried to shut the system down, by using
> <CTRL><ALT><DEL>, and that let me retrieve the DVD, and I was going to
> try booting using an install disk iso, but, it booted into the botched
> PC-BSD thing, and, holding down the <ESC> key, got me a screen that
> had at the bottom,
> "Press enter to boot the selected OS" (the botched PC-BSD, that simply
> fails, was the only OS displayed as an option)"
> " "e' to edit the commands before booting" - meaningless to me
> "or "c' for a command line"
> so I pressed "C", hoping to be able to use a "shutdown" command, so
> that I could boot another computer, so as to download and write a
> current install Debian iso image, and, when I pressed the "c", I got a
> window that appeared, that is a GRUB thing, with the
> "grub>" prompt.
>
> So, now, this has evovled to the new question; what do I type in at
> the GRUB prompt, to make it search for, and, offer as boot options,
> the pre-existing, installed, Ubuntu and Debian installations?
>
>
>
> --
> Bret Busby
> Armadale
> West Australia
> ..............
>
> "So once you do know what the question actually is,
> you'll know what the answer means."
> - Deep Thought,
> Chapter 28 of Book 1 of
> "The Hitchhiker's Guide to the Galaxy:
> A Trilogy In Four Parts",
> written by Douglas Adams,
> published by Pan Books, 1992
>
> ....................................................
>
I have searched and found
http://www.linux.com/learn/tutorials/776643-how-to-rescue-a-non-booting-grub-2-on-linux/
and have done ls, that shows 13 GPT partitions, of which, I know (or
believe) that 3 are operating system installations partitions, so I
apparently need to do an ls on each partition, to find which are the
operating system partitions, then, I believe, enable one of the Linux
partitions, using GRUB, then, boot into that partition, then, run, as
root (so it would need to be the Debian partition, I think),
# update-grub
which would, I hope, restore GRUB as the multiple OS bootloader.
--
Bret Busby
Armadale
West Australia
..............
"So once you do know what the question actually is,
you'll know what the answer means."
- Deep Thought,
Chapter 28 of Book 1 of
"The Hitchhiker's Guide to the Galaxy:
A Trilogy In Four Parts",
written by Douglas Adams,
published by Pan Books, 1992
....................................................
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