Encrypted Drive Unable to Mount. dm_mod missing

[jsmith]

Whenever I try to mount a LUKS encrypted external HD, I get the following error message:

***
/dev/mapper/control: open failed: No such device
Failure to communicate with kernel device-mapper driver.
Check that device-mapper is available in the kernel.
Cannot initialize device-mapper. Is dm_mod kernel module loaded?
***

From what I understand this means that the dm_mod kernel isn't installed. Is there any fix for this? I've installed package updates, but have been unable to fix the problem.

Any help is appreciated.

[CurlyMo]

Somehow it wasn't included in all kernel versions, while it should have. I will fix it when i get back from vacation. In the meanwhile try kernel version 3.2.27 or 3.6.7, those versions did include the module:

Code:

sudo apt-get install xbian-package-kernel3.2.27

or

Code:

sudo apt-get install xbian-package-kernel3.6.7

[CurlyMo]

I have readded these missing modules. Just update the kernel:

Code:

sudo apt-get install xbian-package-kernel3.6.11
sudo modprobe dm_crypt

[jsmith]

I get fatal errors even after doing the above:

FATAL: Module dm_crypt not found.
and
FATAL: Module dm_mod not found.

[CurlyMo]

Dan you did not install the right kernel.

Can you check with:

Code:

dpkg-query -W -f='${Version}\n' "xbian-package-kernel3.6.11"

It should say 1.1

[jsmith]

I installed the right one. It says 1.1 when i query that.

[CurlyMo]

and did you do:

Code:

depmod -a

[jsmith]

yep, i also did that. I also restarted the system, and double checked my installs and packages.

I still get fatal errors.

[CurlyMo]

The modules should be there as you can see on this page: https://github.com/xbianonpi/xbian/tree/xbian-alpha5/lib/modules/3.6.11%2B/kernel/drivers/md

Can you try following this guide: http://forum.xbian.org/thread-211.html
And then try again.

[jsmith]

The above worked. Thanks a lot for all of the help CurlyMo!

I also found that for mounting truecrypt drives I had to disable kernel cryptographic services when mounting altogether by using the command: truecrypt -m=nokernelcrypto [volume] [mountpoint].

LUKS drives work with the regular mounting commands.

Thanks again

[CurlyMo]

And i got the Splash + initramfs working already so no need to look into that.

Can you share your init file with us so we can implement these features by default:
- Mounting NFS root
- Mounting TrueCrypt drives

[cell]

hello... so I found this thread after almost a year and just wanted to ask if the truecrypt package is somewhere handy or to be installed?
i can't find it in default repos, but maybe it's because my apt-get update is partially failing to update the index.

i'd truly appreciate any note if mounting truecrypt volumes is supported.
thanks.

[mk01]

@cell

I'm not really sure true crypt is available from the distro repositories anymore on linux, but last time I was working with it I followed many guides which are around, like this for instance:

https://wiki.archlinux.org/index.php/TrueCrypt

if still remember correctly, true crypt has to be installed/downloaded from true crypt repos / web.

[cell]

I'll follow the guide. thanks a lot.