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I have Ubuntu 15.04 with a default full disk encryption installed on my chromebook Pixel with linux-samus kernel patch and everything is working fine. I've just tried compiling a newer version of the kernel (4.1), but when I'm trying to boot it I'm getting an error where I would normally enter the disk encryption password:

Cannot initialize device-mapper. Is dm_mod kernel module loaded?

I'm guessing something is missing in kernel config, any idea what that is? This is the kernel config file.

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  • I don't see any BLK_DEV_DM (aka «Device Mapper Support») in your kernel config. That sure could explain your issue. – user86969 Jun 21 '15 at 16:12
  • @Nasha Should I add something like BLK_DEV_DM=y somewhere then? – Caballero Jun 21 '15 at 16:26
  • No, definitely not. You should instead run make menuconfig (or make nconfig) and check it from there. It's under «Device drivers» > «Multiple devices driver support (RAID and LVM)» > «Device mapper support». Put a star in front of the latter. – user86969 Jun 21 '15 at 16:34
  • @Nasha It works, you should make it an answer. – Caballero Jun 21 '15 at 17:13
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The Device Mapper driver is missing. Run make nconfig or make menuconfig:

    Device Drivers  --->
    [*] Multiple devices driver support (RAID and LVM)  --->
        <*>   Device mapper support

and recompile your kernel.

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