How to do Chain loading TrueCrypt using GRUB 2 on ubuntu?

[Cham-D!]

Well I have encrypted my system. now I started to use Grub 2 and simply tried to adapt the code which chainload the TrueCrypt bootloader

menuentry "Windows Vista" {
insmod chain
set root=(hd0,1)
chainloader (hd0,2)/truecrypt.mbr
}

As I have selected Windows Vista it simply loads TrueCrypt bootloader however it is prompting that is damaged. Can you tell me why it is happening?

[Loveyboo]

it seems to be bit odd that root is (hd0,1) and you are trying to chainload (hd0,2). You will also see that grub2 number partition from the 1 upwards rather than that of 0 upwards which has been used by grub1. I recommend that you should use root (hd0,2) or chainload (hd0,1) and see whether it is working or not.

[CGale]

You can give a try to below mentioned code and it can help you to resolve the issue of yours.

#make a partition active ("makeactive" in grub legacy)
parttool (hd0,4) boot+

[Aniela]

As far as I know legacy-grub is working fine with truecrypt when you have installed tiny loader in you MBR which is loading other load stages from the boot partition. Grub 2 is installed on MBR and it embeds the core.img which is starting at the sector 1 and that’s why it is overwriting some of the portion of truecrypt loader.

[Evoldo]

After going through the problem I am suggesting below mentioned steps which will be helpful to resolve the matter of yours.
First of all copy rescue ISO file to /boot.

After that you have to execute below mentioned command.

sudo apt-get install syslinux
sudo cp /usr/lib/syslinux/memdisk /boot

now you have to add /etc/grub.d/40_windows_truecrypt

#!/bin/sh
exec tail -n +3 $0
# Windows with TrueCrypt
menuentry "Microsoft Windows" {
insmod part_msdos
insmod ext2
set root='(hd0,msdos3)'
linux16 ($root)/memdisk iso raw
initrd16 ($root)/truecrypt.iso
}

The above mentioned steps is supposed to updating the grub. You can even modify the same according to requirement of yours. (hd0,msdos3) partition should be your /boot and number should begining at 1.

[Baako]

In case TrueCrypt bootloader prompting with an error message such as ‘Error: It appears you are creating a hidden OS.’ Then I am suspecting that there should be remaining of TrueCrypt MBR are available around. You will be able to ignore the same by pressing ‘n’ or you can prevent the error message completely by doing below mentioned thing.
See that you are having TrueCrypt MBR

dd if=$yourhd count=8 bs=1 skip=6
prints "TrueCryp"

simply remove TrueCrypt marker

echo 'grub<3tc' | dd of=$yourhd count=8 bs=1 seek=6