Linux fix the Superblock by DUMPE2FS fsck

It seems that there is a bad superblock. To fix this:

Firstly, boot into a live CD or USB

Find out your partition number by using

sudo fdisk -l|grep Linux|grep -Ev ‘swap‘

Then, list all superblocks by using the command:

sudo dumpe2fs /dev/sda2 | grep superblock

Replace to your drive number sda2

You should get a similar output as this

 Primary superblock at 0, group descriptors at 1-6 Backup Superblock at 32768, group descriptors at 32769-32774 B Ackup Superblock at 98304, group descriptors at 98305-98310 Backup Superblock at 163840, group descriptors at 163841-1638 Superblock at 229376, group descriptors at 229377-229382 backup superblock at 294912, group descriptors at 294 913-294918 backup superblock at 819200, group descriptors at 819201-819206 backup superblock at 884736, group descriptor s at 884737-884742 backup superblock @ 1605632, Group descriptors at 1605633-1605638 backup superblock at 2654208, Grou P descriptors at 2654209-2654214 backup superblock @ 4096000, Group descriptors at 4096001-4096006 backup superblock at 7962624, group descriptors at 7962625-7962630 Backup Superblock at 11239424, group descriptors at 11239425-11239430 Bac Kup Superblock at 20480000, group descriptors at 20480001-20480006 Backup Superblock at 23887872, group descriptors at 23 887873-23887878 

Choose an alternate superblock from the This list, the for the case alternate Superblock # 32768

Now, to check and repair a Linux file system using alternate Superblock # 32768:

sudo fsck -b 32768 /dev/sda2 -y

The flag is used-skip all the questions and to -y Fix? answer them all with a yes automatically

You should get similar output as this:

fsck 1.40.2 (12-Jul-2007)e2fsck 1.40.2 (12-Jul-2007)/dev/sda2 was not cleanly unmounted, check forced.Pass 1: Checking inodes, blocks, and sizesPass 2: Checking directory structurePass 3: Checking directory connectivityPass 4: Checking reference countsPass 5: Checking group summary informationFree blocks count wrong for group #241 (32254, counted=32253).Fix? yesFree blocks count wrong for group #362 (32254, counted=32248).Fix? yesFree blocks count wrong for group #368 (32254, counted=27774).Fix? yes........../dev/sda2: ***** FILE SYSTEM WAS MODIFIED *****/dev/sda2: 59586/30539776 files (0.6% non-contiguous), 3604682/61059048 blocks

Now try mounting the partition

sudo mount /dev/sda2 /mnt

Now, try-to-browse the filesystem with the following commands

cd /mntmkdir testls -lcp file /path/to/safe/location

If you were able to perform the above commands, you had the most probably fixed your error.

Now, restart-computer and you should is able to boot normally.

Linux fix the Superblock by DUMPE2FS fsck