[clug] I feel like a newbie... question

Robert Edwards bob at cs.anu.edu.au
Sat Feb 20 21:46:49 UTC 2016

On 21/02/2016 8:26 am, David C wrote:
> I agree with Rodney's description, I haven't used supergrub, but it sounds
> the right tool for the job. Not having a grub prompt suggests this is an
> easy fix, even though it looks bad.
> If you don't get your hands on supergrub, you should be able to fix it in a
> live CD with a root prompt
> mount $your_root_partition /mnt
> grub-install --boot-partition=/mnt/boot $your_hard_drive
> Your hard drive is probably /dev/sda and your root partition is probably
> /dev/sda1 but you should check before reinstalling grub.

If it were my install and I wanted to repair it, I would:
  - try booting a rescue image (Ubuntu or other)
  - checking and, if necessary, repairing the root partition
  - mount the root partition
  - backup anything I really want to keep
  - chroot into the root partition (need to bind mount /proc, /sys, /dev
     etc. first)
  - try an "apt-get -f install" to fix any packages that aren't fully
  - either run grub from the cmdline, or force remove and re-install it

see how that goes.


Bob Edwards

> On 21 Feb 2016 08:05, "Rodney Peters" <rodneyp at iinet.net.au> wrote:
>> More likely a kernel update has failed to be configured in GRUB and the
>> rest of
>> Ubuntu is in good working order.
>> You could download Supergrub 2 and put that on USB or CD to boot from.  You
>> should then be able to use the menu find and boot the Ubuntu installation.
>> Once booted go through the bootloader setup again.
>> Parted Magic rescue CD also contains Supergrub 2.
>> Rod
>> On Saturday 20 Feb 2016 14:57:24 Peter Ellis wrote:
>>> Thanks, I have a Knoppix 7.4 DVD or the U14.04 stick as a stand-in
>> system.
>>> I have a recent download of the 'Precious', but can update that to the
>>> external drive via Knoppix or the stick.
>>> I can't see GRUB.
>>> The update included a full Linux heart-and-soul update, so something has
>>> gone wrong and its messed up everything.
>>> This feels like a complete reinstall, now. I've done that before, over
>> the
>>> years.
>>> Thanks, all.
>>> Cheers,
>>> Peter
>>> On 20 February 2016 at 12:22, David C <cottrill.david at gmail.com> wrote:
>>>> Whilst I agree that a restore from backup is the correct answer, I am
>>>> reasonably sure you wouldn't be asking this question if you had one.
>>>> Two answers: take a backup then reinstall and restore your data, or fix
>>>> the
>>>> current installation.
>>>> To get a backup, boot to a live CD and copy all of /home and any
>> services
>>>> configurations or data that you hold dear to a separate USB stick. If
>> your
>>>> USB drive is big enough, copy everything. Reinstall from scratch and
>> put
>>>> your data back afterwards. You may need to stuff around fixing file
>>>> ownership.
>>>> To fix the current installation, we/you are going to need more
>>>> information.
>>>> Do you get to the grub menu? If so, remove "quiet" from the kernel line
>>>> for
>>>> the kernel version you're using. This won't fix anything, but will spam
>>>> messages to the screen to tell you more of what is happening. Google
>> for
>>>> grub prompt and you should find enough information to get you started.
>>>> If you get stuck after grub has done its magic it begins to get more
>>>> exciting.
>>>> On 20 Feb 2016 23:22, "Peter Ellis" <vk1pe.peter at gmail.com> wrote:
>>>>> So, I feel like a newbie.
>>>>> I have somehow 'bricked' my Ubuntu 14.4.03 LTS system in an update.
>>>>> Oh, how is that possible? It seems I thought that the 24-hour plus
>>>>> update
>>>>> peocess was too long, so I rebooted the system, then found it
>> 'bricked'.
>>>>> So, I have used my 14.04 USB to reboot; except that... the system
>> wants
>>>> to
>>>>> do a re-install of 14.04 beside 14.04.03 rather than a 'fix' of the
>>>> current
>>>>> system.
>>>>> WHAT can I do to fix or Roll Back the Ubuntu 14.04.03 system, please?
>>>>> Thanks,
>>>>> Peter
>>>>> [currently piggybacking on a W$10 system.]
>>>>> --
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