Repair ext3 journal errors
Remove the journal feature from the file system (downgrade to ext2)
tune2fs -O ^has_journal /dev/sda8
fsck to delete the journal:
e2fsck -f /dev/sda8
recreate the journal (change back to ext3)
tune2fs -j /dev/sda8
and finally, remount it. On a live system, just reboot it.
Another option would be to change the partition to ext2 in /etc/fstab.