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Old 03.07.2015, 08:46
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Ubuntu 14 - grub rescue question

Hi, All,

I am having a problem with my PC with Ubuntu on it. After I've updated some software as usual and restated the computer, it went into grub rescue mode. I can see the partitions, but soon after that I get error messages. Some of them are:
1. unknown filesystem
2. invalid arch-dependent ELF magic (this after I type insmod(blah blah blah)

I tried to no avail several things suggested by the Ubuntu forum. I had some unsaved files there - are they lost or are they just sitting pretty waiting to be accessed.

Help, please!
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Old 03.07.2015, 08:58
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Re: Ubuntu 14 - grub rescue question

Your files likely aren't lost. Something may have screwed up with your kernel upgrade, I'm not actually too familiar with how Ubuntu decides it needs to fail out of GRUB but chances are GRUB is failing (for some reason) to load the kernel image, or the kernel is unable to load the initram.

Can you take a picture of the actual screen with your cellphone?

If you want to access your files, install Ubuntu or some other distro onto a USB key and liveboot from the key, and just mount your drive as normal (you can use something like cfdisk to look at your partitions, I don't know Ubuntu's default partition scheme, probably near /dev/sda3).

Afterwards you can try a fresh install, or try to fix it. How you got to this state sounds like a fun journey
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Old 03.07.2015, 15:03
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Re: Ubuntu 14 - grub rescue question

Can you access the grub menu on boot (hold down ESC iirc)? Just load the previous kernel via the menu entry and you'll be able to fix whatever went wrong. You can also boot via usb or livecd to access your files.
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Old 04.07.2015, 13:50
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Re: Ubuntu 14 - grub rescue question

Happy 4th of July!

Thanks Vostok4 and Noth. Still struggling. I'm not well versed in Ubuntu. I tried the USB route - formatting it in FAT32 and downloading Ubuntu on it, but on a Mac (could this be a problem?) and it makes me nervous; the only PC I have is the Ubuntu one.

So far my progress is minimal - I have the Ubuntu installer on a USB but the computer fails to boot from it.
1. If I simply turn on the computer, with or without the USB stick in, it goes straight to the "rescue grub" window.
2. Holding any key - only F12 brings me a bit "closer" to having some choices, but again, it gets stuck.
3. I changed the order of booting, so that the USB should be opened first. - nothing

I am still looking for solutions.
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Old 04.07.2015, 13:59
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Re: Ubuntu 14 - grub rescue question

open a terminal on the mac and type dd if=/whereyouriso/ubuntu.iso of=/dev/sd1

You'll have to ajust the path of the iso image and what the dev unit the usb key is of course. This will give you a bootable media.
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Old 04.07.2015, 20:24
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Re: Ubuntu 14 - grub rescue question

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I tried the USB route - formatting it in FAT32 and downloading Ubuntu on it, but on a Mac (could this be a problem?)
This might be relevant to your situation:

FAT32 doesn't support files larger than 4 GB, and that's its greatest drawback. You also can't create a startup drive for your Mac using this format.

See here:

http://www.engadget.com/2011/09/19/m...-flash-drives/
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Old 04.07.2015, 23:20
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Re: Ubuntu 14 - grub rescue question

Thanks all for your input. I think I managed to reinstall off a USB stick. I say "I think" because after I managed to see a few things happening, we got invited to a party , and seeing how it is 4th of July and all... Tomorrow I will check if what the computer went through caused any lost files.

Thanks, 10pixels, that would have been so useful to know yesterday, and if I still run into trouble, I would definitely try it.
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Old 04.07.2015, 23:40
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Re: Ubuntu 14 - grub rescue question

What we should have pointed you to was to Unetbootin the USB bootable drive creator... : http://unetbootin.sourceforge.net/ Sorry about that. Enjoy the 4th of July celebrations!
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Old 04.07.2015, 23:44
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Re: Ubuntu 14 - grub rescue question

Yeah, found this website myself (accidentally), and it proved to be a very good resource. No need for apologies. Thanks for the support.
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Old 05.07.2015, 11:59
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Re: Ubuntu 14 - grub rescue question

Happy to report that no files got lost!!! I am amazed! Take that Windows and Macs!
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Old 05.07.2015, 12:18
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Re: Ubuntu 14 - grub rescue question

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Happy to report that no files got lost!!! I am amazed! Take that Windows and Macs!
That's the way it should be. Or why I use *nix (with /home partition).
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