ext4 partition type unknow after restart and cannot be mount

Question

After restarting my pc, I've stuck on error of my /home partition. It cannot be mount. Partition table is unknown. For this partition I had dedicated Goodram ssd 250 gb drive. On this disk there was only one partition /dev/sdb1 with ext4 file system and was mounted in /home

Now I have errors:

`mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
   missing codepage or helper program, or other error

   In some cases useful info is found in syslog - try
   dmesg | tail or so.`


kubuntu@kubuntu:~$ dmesg | tail 
[   49.547358] intel_rapl: Found RAPL domain package
[   49.547362] intel_rapl: Found RAPL domain core
[   49.547363] intel_rapl: Found RAPL domain uncore
[   49.547365] intel_rapl: Found RAPL domain dram
[   64.136847] IPv6: ADDRCONF(NETDEV_UP): enp2s0: link is not ready
[   64.603022] r8169 0000:02:00.0 enp2s0: link down
[   64.603037] r8169 0000:02:00.0 enp2s0: link down
[   64.603078] IPv6: ADDRCONF(NETDEV_UP): enp2s0: link is not ready
[   66.907978] r8169 0000:02:00.0 enp2s0: link up
[   66.907984] IPv6: ADDRCONF(NETDEV_CHANGE): enp2s0: link becomes ready
kubuntu@kubuntu:~$ 

tune2fs: Bad magic number in super-block while trying to open /dev/sdc1 Couldn't find valid filesystem superblock.

In GParted I have I've taken 500GB HDD drive (/dev/sdc) and formated, shredded(3 times), and using clonezilla backup disk to disk from /dev/sdb to /dev/sdc So I have exactly (even uuid is the same) copy of my /home drive.

Now I would like to restore partition table on my ssd. If that is impossible I would like to restore as much files as possible.

Here is some console output:

kubuntu@kubuntu:~$ sudo fdisk -l

Disk /dev/sda: 223.6 GiB, 240057409536 bytes, 468862128 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: E1F5B6D8-76DD-40EF-BF83-CE8758E2CA29

Device         Start       End   Sectors  Size Type
/dev/sda1       2048   1050623   1048576  512M EFI System
/dev/sda2    1050624 207005695 205955072 98.2G Linux filesystem
/dev/sda3  435556352 468860927  33304576 15.9G Linux swap
/dev/sda4  207005696 435556351 228550656  109G Linux filesystem

Partition table entries are not in disk order.


Disk /dev/sdb: 223.6 GiB, 240057409536 bytes, 468862128 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x000957b3

Device     Boot Start       End   Sectors   Size Id Type
/dev/sdb1          63 468857024 468856962 223.6G 83 Linux


Disk /dev/sdc: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x000957b3

Device     Boot Start       End   Sectors   Size Id Type
/dev/sdc1          63 468857024 468856962 223.6G 83 Linux

---

sudo blkid
/dev/sdb1: PARTUUID="000957b3-01"
/dev/sdc1: PARTUUID="000957b3-01"

And now I am on live cd os. I need Your help, cause I did not had that problem ever (I am a 10 years linux user).

Please help me restore my partition table on /dev/sdb.

Answer 1

If you're positive it's an ext4 partition, you can try running fsck on it to see if the built in tools can recover the partition:

fsck.ext4 -vn /dev/sdc1

If that looks promising, run it for real:

fsck.ext4 -vy /dev/sdc1

If you're not positive, you can check your /etc/fstab for the entry for /home, or you can possibly try running something like

file -s /dev/sdc1

to see if it's recognized as an ext4 partition (your gparted output suggests it's not recognized however, but this can help in other cases in the future).