[dm-crypt] /sbin/cryptsetup: not found on boot after Grub repair - manual mounting works

Aaron lists at whitehouse.kiwi.nz
Wed May 25 20:25:30 CEST 2016


Thank you Sven, that was extremely helpful. Thank you also to Hugh and
Arno for their replies.

You were correct, this was caused by my mounting the encrypted
filesystem under a different name (the UUID), rather than sda6_crypt.

Full step-by-step commands of how I fixed this are here:
https://answers.launchpad.net/ubuntu/+source/cryptsetup/+question/293750

Thanks again!

Aaron

On 22/05/16 02:34, Sven Eschenberg wrote:
> Hi there,
>
> This seems to be the relevant part:
> device-mapper: table ioctl on sda6_crypt failed: No such device or
> address
> Command failed
> cryptsetup: WARNING: failed to determine cipher modules to load for
> sda6_crypt
>
> It basically tells you your cryptodevice is missing and thus no info
> could be grabbed which in turn does not include cryptsetup etc. into
> your initramfs.
>
> When booting into the live system, unlock and mount your stuff before
> chrooting and make sure that all the mapper names are EXACTLY as
> expected by mkinitramfs (update-initramfs). ESP: Consult your crypttab
> file to find the name. Once the mapped device (as noted in crypttab)
> can be found running update-initramfs should work and include
> everything that is needed.
>
> Regards
>
> -Sven
>
> P.S.: If I am not mistaken your mapping is supposed to be called
> sda6_crypt, while bootrepair gave it a UUID-based name. So you'll
> probably have to work this through manually, I guess.
>
>
> Am 21.05.2016 um 16:14 schrieb Aaron:
>> Hello,
>>
>> I would really appreciate any help to make my system boot properly
>> again. I can manually mount my encrypted partitions and they unlock
>> correctly, so I'm pretty sure that I haven't lost my data, but something
>> that used to work in the Ubuntu 16.04 boot process to unlock and boot
>> the partitions must have broken, as whenever I boot now, typing my
>> password no longer unlocks and boots Ubuntu. Instead it says:
>> “cryptsetup: cryptsetup failed, bad password or options?”
>>
>> If I press escape and get to the console output, it says:
>> /scripts/local-top/cryptroot: line 1: /sbin/cryptsetup: not found over
>> and over.
>>
>> In case the history is relevant, I recently had to reinstall Windows on
>> a dual-boot machine. That meant that I had to use boot repair to get my
>> Grub back. I now have what seems to be a working Grub, but when I boot
>> into Ubuntu and enter my password into the “Please unlock disk
>> sda6_crypt”, it fails as described.
>> http://paste.ubuntu.com/16443425/
>> was the output of the boot-repair reconfiguration of Grub.
>>
>> I booted in with a live CD and chrooted into my installation. I did an
>> apt-get update and apt-get upgrade and I see the following in the
>> output:
>> Processing triggers for initramfs-tools (0.122ubuntu8) ...
>> update-initramfs: Generating /boot/initrd.img-4.4.0-22-generic
>> device-mapper: table ioctl on sda6_crypt failed: No such device or
>> address
>> Command failed
>> cryptsetup: WARNING: failed to determine cipher modules to load for
>> sda6_crypt
>>
>> I asked for help here:
>> https://answers.launchpad.net/ubuntu/+source/cryptsetup/+question/293750
>> but nobody has had any ideas so far.
>>
>> Any ideas would be greatly, greatly appreciated.
>>
>> Kind regards,
>>
>> Aaron
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>> dm-crypt at saout.de
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