Troubleshoot BackTrack5 Linux full disk encryption

I have used this great tutorial to install BackTrack 5 with full disk encryption on my laptop:

 I preffer to have BackTrack 5 bootable from my USB disk also if I need it.
And I need it if I do any update to grub or certain packages in BT5, so I preffer to have this set of commands handy to fix issues with my encrypted partition.
You just have to boot BackTrack 5 from LiveCD / USB and do the following:
/etc/init.d/networking start
apt-get update
apt-get instal hashalot
cryptsetup luksOpen /dev/[your logical partition] pvcrypt
mkdir /mnt/bt5
mount /dev/mapper/vg-root /mnt/backtrack5
mount /dev/[boot partition] /mnt/backtrack5/boot
mount -t proc proc /mnt/bt5/proc
mount -t sysfs sys /mnt/bt5/sys
mount -o bind /dev /mnt/bt5/dev
chroot /mnt/bt5

Once you are in chroot-ed enviroment of your encrypted drive now you can do for example GRUB update.

After you are done, you can just reboot. If you still can not boot into BackTrack, repeat the steps and try to figure out what step went wrong.

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