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

Hugh Bragg hughbragg at dodo.com.au
Sat May 21 20:58:48 CEST 2016

It sounds like you need to update-grub
Assuming your grub configurations haven't changed since the original 
build, you're probably looking for something like this:
On 22/05/16 00:14, Aaron wrote:
> 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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