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error: unknown filesystem - grub rescue>

Hi everyone,

I have a problem with my laptop.

I had windows 7 installed for quite some time, and now decided to install ubuntu too.  I used Easeus Partition Master Home Edition to create a new partition in my drive and make room for ubuntu.

I was able to install ubuntu succesfully and I even had the chance to install a few programs and make some updates the first time I used it.  But once I rebooted and tried to start windows, an error occurred and now I see this in the screen:

error: unkown filesystem
grub rescue>

Searching in the internet I found that Rescatux could be the solution.  I downloaded it, burned the iso in a cd and followed the instructions.  No success!  The operation failed.

What can I do?  any help?
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Gabriel_Espinoza
Asked:
Gabriel_Espinoza
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1 Solution
 
overtheclock007Commented:
TO restore your boot sector and MBR, soo windows can boot.

reboot in safe mode command line
and
then
type
FIXMBR
and
FIXBOOT

"Now at the prompt, type in fixmbr. Your damaged MBR will now be replaced with a new master boot record and your computer should now be able to boot properly. Note that you may also want to run the fixboot command to repair the boot sector with a new one."

you won´t be able to boot linux but you will be able to boot windows 7 and try a new linux instalation.
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wesly_chenCommented:
Here is Recovering the Vista or Windows 7 Bootloader from the DVD
http://neosmart.net/wiki/display/EBCD/Recovering+the+Vista+Bootloader+from+the+DVD
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Gabriel_EspinozaAuthor Commented:
if I do this, then which is the best way to re-install ubuntu without having this problem again?

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wesly_chenCommented:
Check the section "install Ubuntu after Windows"
https://help.ubuntu.com/community/WindowsDualBoot
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wesly_chenCommented:
Here is another guide
http://www.dedoimedo.com/computers/dual-boot-windows-7-ubuntu.html
----
Scenario: Windows 7 is installed
  --- Configure bootloader

Make sure you can boot from Windows after shrunk the Windows partition before install Ubuntu.
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Gabriel_EspinozaAuthor Commented:
I tried through the command line,  I tried with the windows recovering cd, and nothing!

HELP!
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Gabriel_EspinozaAuthor Commented:
I finally acheived something...

I reinstalled grub2 with the ubuntu live cd, and now when booting the screen shows a grub> prompt.

I also downloaded and burned the super grub2 disk and with it I was able to load windows.  This was great news, I took the opportunity to store all my files in an external hard drive.

Right now the obvious solution seems to be a complete drive formatting.  I wish I could recover my windows installation so I wouldn't have to install all my software again.

Is there a way to do this easily?

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mccrackyCommented:
If you can boot both OSs, which you say you can.  You don't need to reinstall, but just get GRUB set up to recognize the two.

Here is one of the better links for Ubuntu:
https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows?action=show&redirect=RestoreGrub
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Gabriel_EspinozaAuthor Commented:
thanks

I try to follow the instructions, but my partitions just don't seem to be right.

I don't get the outputs I'm supposed to get.  For starters, I can't mount the File System drive!  and the boot file doesn't have what the page says it should have.
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Gabriel_EspinozaAuthor Commented:
I now used EasyBCD to add Ubuntu as an entry in the bootloader and then re-create/repair the boot files.
When I start my laptop, it shows the two OS and I can choose which one I want to load.  

The problem is that when I choose Ubuntu, it only show the grub prompt.
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Pierre FrançoisSenior consultantCommented:
If Windows is booting but not Ubuntu, you are very close to the solution. The first screen you see, giving you the choice between Windows and Ubuntu, is it the GRUB screen, or did you install another initial loader with EasyBCD?
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Pierre FrançoisSenior consultantCommented:
After seeing what EasyBCD does, I understand it came into the MBR instead of GRUB. The trick for you is to reinstall GRUB, BUT NOT INTO THE MBR. Follow the instructions at http://neosmart.net/wiki/display/EBCD/Linux under "Linux before Vista" because you had a fully working Linux install before you ran EasyBCD.
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Gabriel_EspinozaAuthor Commented:
Thanks, I'll try that and get back to you.

Meanwhile, when I work in Windows a notification in my task bar appears every 5 minutes saying that there is not enough space in that partition.  I guess that the partition that I made for Ubuntu is too small.  Should I modify it and make it bigger?  Should I have made a third partition to store files?
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wesly_chenCommented:
> Should I have made a third partition to store files?
This one is easier and not destructive.
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Pierre FrançoisSenior consultantCommented:
@Gabriel: if Windows is complaining about space, it means the Windows partition is too small. So it is a good idea to shrink to Ubuntu partition and to grow the Windows one. But removing unused software from Windows is perhaps easier than to resize partitions.

Making a data partition in a format you can access from Windows (Windows only accesses vfat, ntfs, and perhaps something more) and from Linux (Linux can access nearly all types) is always a good idea.
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Gabriel_EspinozaAuthor Commented:
Ok.  NOW I'M STARTING TO PANIC!


1.  pfracois:  the solution you proposed did not work.  I printed the instructions to follow them closely, but once I was within the grub program any command I typed gave me different errors.  For example, there was a problem with the partitions being NTFS.


2.  Looks like I didn't explain myself well in my last comment.  The notification windows gives me is about the Linux partition.  Here is the image of the notification.  It's in spanish, but it basically says that there is not enough space in the L drive, my Linux partition.

  windows notification

3.  Because I used Easeus to modify my partitions in the first place I ran the program to take a look at what I'm facing.  It looks like I have a mess, there are a lot of partitions I didn't know I had, and I don't know which are useful and which are not.  I really don't understand very well what I saw, but maybe you can help.  I also attached the image with that information.

 Information that Easeus gives me

At this point I'm thinking of wiping my hard disk and starting all over again.  Surely someone knows a better way to solve this, but I really need my two OSs to work soon.  I would prefer to save that time, so I hope you can help.

 
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mccrackyCommented:
A couple of comments:

1. The partitioning does look a little strange.  2.5GB for Linux isn't much and I would personally not put Linux on an NTFS partition.

2. While it might be nice to try to solve this problem, if you have your data saved as a backup somewhere, it might be easier to just start over installing windows first and then Linux (on an ext3 or ext4 partition with at least 10GB.

3. It looks as if you started trying to put Linux on another 100GB partition and 2.5GB NTFS for data?

4. I'm not familiar with EasyBCD, so can't comment on what it might have changed or done.
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Pierre FrançoisSenior consultantCommented:
I agree with mccracky. Don't put the root of Linux on a NTFS partition. You have 100GB free (unallocated). Reinstall your Linux and put your Linux for instance in that unallocated space. Leave the recovery partition unchanged for now: it is less than 5GB.

Last but not least: Windows always gives dumb warnings about near to full diskspaces. Just ignore these: How could MS people know how many free space the Linux partition needs?

Moreover, if you put Linux on a ext3 or ext4 partition, and if you want, put some data for both systems on a NTFS partition, the error message will disappear.

Thank you for translating the Spanish error message, pero yo hablo el castellano casi mejor que el inglés. Un cordial saludo y ¡mucho ánimo! Que no te entre el pánico: no hay de que.

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Gabriel_EspinozaAuthor Commented:
Gracias pfrancois  :)  and thanks mccracky.

So, in order to switch from NTFS to FAT32 I should wipe the partition, correct?
What method do you recommend for this?

What do you mean with putting linux on a ext3 or ext4?
And yes, I wish to have a place to share data between both systems.  How should I do this?
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wesly_chenCommented:
> I wish to have a place to share data between both systems.  How should I do this?
You can read-write NTFS in Linux OS by install NTFS-3g
http://www.tuxera.com/community/ntfs-3g-download/
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mccrackyCommented:
De nada :)

you shouldn't change to FAT32.  NTFS is fine for sharing between Linux and Windows.

Install Linux (as ext3 or ext4 - it should do it in the install) on the 100GB empty partition and use the 2.5 GB for data sharing.

Or you can repartition to have Linux on about a 20GB drive and use the rest for data sharing if you like.
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Pierre FrançoisSenior consultantCommented:
I agree with mccracky.
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Gabriel_EspinozaAuthor Commented:
Thank you all, I have reinstalled linux with mccracky's advice.
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