Recovering After Windows 7 Install: Rescue Cannot Mount Root

I have a dual boot laptop with debian stable & Windows 7.

The HD partitions a
sda1: NTFS for W7
sda2: FAT32 (currently unused)
sda3: linux /boot
sda4: linux ext4, which is LVM with encryption

I've re-installed W7 and now need to recover the MBR & grub menu.

I've booted with the netinst usb in rescue mode, but it fails to mount the root partition /sda4:
"An error occured while mounting the device you entered for your root file system (/dev/sda4) on /target"

and /var/syslog shows:
Code:
rescue-mode: selected root device '/dev/sda4'
umount: cant umount /target: Invalid argument
isofs_fill_super: bread failed, dev=sda4, iso_blknum=16, block=32
EXT2-fs (sda4): error: unable to readsuperblock
EXT3-fs (sda4): error: unable to readsuperblock
rescue: mount: mounting /dev/sda4 on /target failed: Invalid argument

So it seems like something is wrong with the mount command?

Would appreciate suggestions how to solve this.

Thanks


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Hi,

I have problems mounting my second drive at boot automatically.
(sorry i am a noob)

When i use the mount command, it works fine.
Code:
mount -t ext3 /dev/sdb2 /mnt/HD/HD_b2

But when i try to add one if the following lines to /etc/fstab
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mount -a

, also fstab is empty afer reboot (normal??)

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/dev/sdb2 /mnt/HD/HD_b2 ext3 defaults,errors=remount-ro 0 1

Code:
UUID=553afede-fa45-4cdc-9972-c0a9aa899509 /mnt/HD/HD_b2 ext3 errors=remount-ro 0 1

Code:
/dev/sdb2 /mnt/HD/HD_b2 ext3 rw 0 0

Code:
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output blkid:

Code:
/dev/sda1: UUID="e67e5c15-7b8b-9389-c311-e5d4c61326f9" TYPE="linux_raid_member"
/dev/sda2: UUID="09e0e365-0aa6-4214-b571-2bc6b027fd9f" TYPE="ext3"
/dev/sda4: UUID="64038414-136c-4939-bd14-9871a20290bd" TYPE="ext3"
/dev/sdb1: UUID="e67e5c15-7b8b-9389-c311-e5d4c61326f9" TYPE="linux_raid_member"
/dev/sdb2: UUID="553afede-fa45-4cdc-9972-c0a9aa899509" TYPE="ext3"
/dev/sdb4: UUID="bf594be6-ffb6-469d-a3a8-246be66a4d90" TYPE="ext2"

/etc/mtab:

Code:
rootfs / rootfs rw 0 0
/dev/root / ext2 rw,relatime,errors=continue 0 0
sysfs /sys sysfs rw,relatime 0 0
proc /proc proc rw,relatime 0 0
squash /usr/local/tmp ramfs rw,relatime,size=38m 0 0
/dev/loop0 /usr/local/modules squashfs ro,relatime 0 0
/dev/mtdblock5 /usr/local/config jffs2 rw,relatime 0 0
/dev/sda4 /mnt/HD_a4 ext3 rw,relatime,errors=continue,data=writeback 0 0
/dev/sdb4 /mnt/HD_b4 ext2 rw,relatime,errors=continue 0 0
none /proc/bus/usb usbfs rw,relatime 0 0
/dev/sda2 /mnt/HD/HD_a2 ext3 rw,relatime,errors=continue,user_xattr,data=writeb$
/dev/sdb2 /mnt/HD/HD_b2 ext3 rw,relatime,errors=continue,user_xattr,data=writeb$
/dev/sda2 /mnt/HD/HD_a2/squeeze/mnt/HD/HD_a2 ext3 rw,relatime,errors=continue,u$
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sysfs /mnt/HD/HD_a2/squeeze/sys sysfs rw,relatime 0 0
proc /mnt/HD/HD_a2/squeeze/proc proc rw,relatime 0 0

When mount command is used Code:
mount -t ext3 /dev/sdb2 /mnt/HD/HD_b2

The following line is added to mstab -->
Code:
/dev/sdb2 /mnt/HD/HD_b2 ext3 rw 0 0

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Linux delarocha 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt2-1 (2014-12-08) x86_64 GNU/Linux

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# /boot was on /dev/sda1 during installation
UUID=5bbedec0-6e3d-4185-91e0-292a72585908 /boot           ext2    defaults        0       2
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