Recently, when I booted my ubuntu partition, I recieved an Initramfs error. I followed the directions in this post:

Initramfs error during boot

However, when I ran the command:

sudo fsck /dev/sdb1

(As a side note, my ubuntu partition is on sdb) I recieved another error saying:

ext2fs_check_desc: Corrupt group descriptor: bad block for block bitmap
fsck.ext4: Group descriptors look bad... trying backup blocks...
Journal superblock has an unknown incompatible feature flag set.
Abort <y>?

I type no and the next thing says:

Journal superblock is corrupt

Next comes a series of y to fix this issue.

My question is this, is there a better method to fix a corrupt superblock? Or does this mean I need to reinstall ubuntu 14.04?

1 Answer 1


Let me offer you a solution I found:

  1. Reboot from a live CD

  2. Find out which partition we are dealing with"

    sudo fdisk -l
    # but in your case its sdd1
  3. Make sure its a superblock problem with:

    sudo fsck.ext4 -v /dev/xxx # in your case xxx => sdb
  4. Check for your super block backups location:

    sudo mke2fs -n /dev/xxx
    # Results:
    Superblock backups stored on blocks:
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208
  5. Restore superblock from backup with and repeat till its fixed:

    sudo e2fsck -b block_number /dev/xxx
  6. If step 4 does not work repeat with next value in step 3




Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.