I have both windows and linux run on same machine. In Windows, when I set parition C to main boot, I cannot use GRUB anymore. So, I decide to reinstall GRUB.

But, when I use Fedora live CD to boot. I don't see previous Linux parition. I juse see Windows partition. So, I don't know how to mount linux partition to install GRUB.

Here is the output of command:

su -c "/sbin/fdisk -l /dev/sd?"

Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63   188747684    94373811    7  HPFS/NTFS/exFAT
/dev/sda2       188747685   976768064   394010190    f  W95 Ext'd (LBA)
/dev/sda5       251674353   566259119   157292383+   7  HPFS/NTFS/exFAT
/dev/sda6       566259183   976768064   205254441    7  HPFS/NTFS/exFAT

As you see, maybe sda2 is the linux partition. So, I use this command:

mount -t ext4 /dev/sda2 /mnt

mount: wrong fs type, bad option, bad superblock on /dev/sda2, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so

I don't know does sda2 is real linux partition or not. (it doesn't appear partition size, so I cannot know). but if this true, I'm pretty sure the partition is format in ext4.

Please help me.

Thanks :)

  • What is the output of sudo blkid /dev/sda*?
    – Chris Down
    Commented Nov 12, 2012 at 3:16
  • sda2 is the extended partition. do you have another hard disk installed, i mean /dev/sdb ? Commented Nov 12, 2012 at 3:18
  • @LiuYan刘研 no. I doesn't have another disk installed. But when I fist install Linux, linux partition is in LVM Group. Does it matter ?
    – hqt
    Commented Nov 12, 2012 at 5:45
  • @hqt, it doesn't matter. so far I can see is there's no linux partition in your hard disk drive. How did you installed the dual boot? Did you installed linux first, then windows? What did you mean "when I set parition C to main boot"? Commented Nov 12, 2012 at 7:51

1 Answer 1


for sure /dev/sda2 is not the parition you want if you were using LVM i suppose sda5 or sda6 is your physical volume

to list possible physical volumes use

lvm lvmdiskscan
to scan for logical volumes
 lvm lvscan
lvm vgscan -v
might be helpful

here is nice description of recovery process

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