I try recover the backup superblock on /dev/sda2 that contain ubuntu 12.04 LTS and partition ext4 with livecd ubuntu 10.04. the message is below root@ubuntu:/home/ubuntu# fsck.ext4 -b 163840 -B 4096 /dev/sda2 e2fsck 1.41.11 (14-Mar-2010) /dev/sda2 was not cleanly unmounted, check forced. Resize inode not valid. Recreate? yes Pass 1: Checking…