Wubi, Windows Ubuntu Installer

Wubi "prefix" is not set

Asked by Abhinav Arora on 2011-09-15

Hello everybody

I installed Ubuntu 11.04 alongside windows using Wubi with a partition of 15gb. I installed it in my G: drive while windows is installed in C: drive Everything was working fine until I installed some updates using the Update Manager.

Now when i select Ubuntu from the multi boot screen, I get the following message:

NTFS5 error "prefix" is not set
Not found; /ubuntu/disks/root.disk
Not found; /ubuntu/install/boot/grub/grub.cfg

Immediately after this message i am directed to a Grub Command line.

Moreover, when i open my ubuntu installation directory from windows, I am unable to find the following folders:

/ubuntu/disks
/ubuntu/install/boot

I also uninstalled Ubuntu using add remove program in Control panel and then reinstalled it using Wubi. However after updating i again faced the same problem.

Please Help!!

Question information

Language:
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Status:
Open
For:
Wubi Edit question
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Last query:
2011-09-19
Last reply:
2011-09-15
bcbc (bcbc) said : #1

If you are getting regular corruption of the \ubuntu\disks directory there may be some hardware compatibility issue. Please list your specs: computer brand/model, graphics card. If the corruption is due to forced shutdowns, please avoid these by trying the options listed here: https://wiki.ubuntu.com/WubiGuide#How_to_reboot_cleanly_even_when_the_keyboard.2BAC8-mouse_are_frozen

For info on how to recover the lost data refer to the following: http://ubuntu-with-wubi.blogspot.com/2011/08/missing-rootdisk.html

PS That 'prefix' not set message is always issued on 11.04 Natty Wubi installs - and does not indicate any problem. The problem you are having is NTFS file system corruption.

Abhinav Arora (abhinav-arora) said : #2

Hi the following are the laptop specifications:

Acer Aspire 5920
2GB RAM
Intel Graphics accelerator.

Now I have reinstalled it using Wubi, but this time I am not updating my Ubuntu. So now it is working fine. But as soon as I install new updates, the same errors will appear again.

Is it a problem related to updates?

bcbc (bcbc) said : #3

I can't find any issue with this computer and Ubuntu... so this is a bit of a mystery. You could try a proper dual boot or use a virtual machine (or just don't update as you say, but it doesn't seem an ideal solutio).

Abhinav Arora (abhinav-arora) said : #4

I did the same procedure on a Dell Laptop and then i I updated it. It worked perfectly fine on it without any errors.

Can you help with this problem?

Provide an answer of your own, or ask Abhinav Arora for more information if necessary.

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