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Old 05-01-2009, 06:37 PM   #1
Registered: Dec 2008
Distribution: slackware
Posts: 50

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Kubuntu 9.04 and Encrypted LVM

It seems to me that a lot of people are raving about Ubuntu, so I thought I would give it a try. However, I'm running into some serious issues just getting the thing installed. I'm trying to get an LUKS+LVM setup I was using under Slackware.

Using the standard disc, I can't even connect to the network out of the box. Once I load the needed packages for wicd from a flash drive, I can connect to the internet and install cryptsetup, lvm, etc.... However, when I get to the partition setup part of the install, the window gets set to some ridiculous size, much taller than my display. I can't use it and resizing doesn't help. On to alternate....

The alternate disc, however, is unable to even MOUNT the lvm volumes. I modprobed the same modules I used on the desktop disc, but cryptsetup returns "No key available with this password" I really REALLY don't want to use the installer to recreate the volumes because a: I want to choose the cipher, and b.) I don't feel that wiping the disc and installing over existing partitions is acceptable practice. There should be a way to use the existing partitions. If the install gets messed up, I want to be able to reinstall the OS and leave my data alone.

My question, basically, is how do I install Kubuntu 9.04 on LUKS+LVM? I don't care what disc I have to use. Any help or suggestions would be greatly appreciated.
Old 05-02-2009, 12:59 AM   #2
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Registered: Jun 2006
Location: Philadelphia PA USA
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Here are some recent articles on LVM that were on distrowatch weekly. The 2nd one discusses using LVM on several distros and includes a discussion on installing Ubuntu on LVM using the alternate install CD:
Old 05-02-2009, 09:55 AM   #3
Registered: Dec 2008
Distribution: slackware
Posts: 50

Original Poster
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Thanks, but while those articles are interesting, they don't solve the problem. My problem isn't that I can't create the LVMs, but that I can't USE them. More specifically, the alternate install disc can't open the LUKS.

cryptsetup luksOpen /dev/sda2 pvcrypt
That fails with "No key available with this password", which is an error that indicates one of the needed kernel modules is not loaded. I've already loaded dm-mod, aes, sha256, dm-crypt, etc.... but cryptsetup still returns that error. My question now I guess is what kernel modules do I need to use on the alternate disc to get cryptsetup to work?
Old 05-02-2009, 04:33 PM   #4
Registered: Dec 2008
Distribution: slackware
Posts: 50

Original Poster
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OK, I gave up trying to open the existing LUKS and decided to make a new one. The problem now, that doesn't work either!

cryptsetup -y --cipher aes-xts-plain -key-size 512 luksFormat /dev/sda2
complains that it cannot "...setup dm-crypt key mapping." and that I should check the kernel support for the cipher. aes is already loaded though. I really don't understand this, because this is the exact same command I used when I created the LUKS on the desktop disc in the first place. The command I really want to use is....

cryptsetup -y --cipher aes-xts-plain -key-size 512 -h sha512 luksFormat /dev/sda2
using a different hash algorithm. That doesn't work either....


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