[SOLVED] grub rescue: "error: unknown filesystem" when booting Windows XP / Ubuntu dual boot
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grub rescue: "error: unknown filesystem" when booting Windows XP / Ubuntu dual boot
Hello all, I've got an Asus Eee which came with Windows XP. I created a partition (in Windows), then installed Ubuntu 10.10 Desktop Edition using their Windows Installer. When I restarted, I was able to choose which system to boot, and booted Ubuntu. After some time, I needed to restart to update Firefox.
When I did so, I got a screen reading
error: no such device: 7a285807-cc13-4b9d-9952-04d611caf3ae
and was given a command line
Some commands I thought would work didn't, e.g. 'help', but I did manage to find out through 'set' that
and that the only available drive was 'hd0'. I tried to start as normal with
but I get the message
error: unknown filesystem
I have an external CD/DVD writer that I can connect via USB, as well as a USB hard drive. I actually made an installation CD for the same Ubuntu distribution before all this happened, if that could potentially help.
Last edited by LittleRatRottenHut; 01-31-2011 at 03:49 PM.
If you mean the Ubuntu live CD, I would love to load it, but how can I do that? When I turn on the computer, all I get is the 'grub rescue>' command line. My netbook has no internal CD-ROM drive, and apparently it won't load from the USB CD-ROM drive. I also made an Ubuntu installation USB thumbdrive with linuxpendrive.com, but it also didn't make a difference -- I still only see 'grub rescue>' and hd0.
Oh, excellent! I hadn't realized I could still access BIOS. I've loaded Ubuntu from my USB thumbdrive. How can I fix my problem from here? I think the main problem is grub not understanding the partition?
My mounted drives are File System, 52 GB Filesystem (which contains several Windows folders), 'PE', and 'Ubuntu'.
Last edited by LittleRatRottenHut; 01-31-2011 at 09:01 PM.
Reason: added more info
Wubi just seems such a kludge (I've never used it).
From the USB, go to sf.net and get bootinfoscript. Run that and post the RESULTS.txt - hopefully it can deal with wubi since it was written by Ubuntu folks.
File system: ntfs
Boot sector type: Windows XP
Boot sector info: No errors found in the Boot Parameter Block.
Operating System: Windows XP
Boot files/dirs: /boot.ini /ntldr /NTDETECT.COM /wubildr.mbr /wubildr
File system: ntfs
Boot sector type: Windows XP
Boot sector info: According to the info in the boot sector, sda5 starts
at sector 63.
Boot files/dirs: /ubuntu/winboot/wubildr.mbr /ubuntu/winboot/wubildr
File system: ext4
Boot sector type: -
Boot sector info:
mount: unknown filesystem type ''
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
Thanks for the help, everyone, but I got my problem resolve elsewhere. The solution involved a Windows installation disk (which didn't come with my netbook) used to run cmd. The techs I took it to then did some magical thing at the command line that allowed me to access my Windows XP partition. From there it was just a matter of repartitioning and trying the installation again, which worked this time, for reasons I can't fathom, since I did the exact same installation process.