Tutorials/Tips, Ubuntu

How to install Ubuntu 11.04 on an encrypted LVM file system

How much space from the VG should be allocated to the root LV? Ubuntu 11.04 installer recommends 4.4 GB, but a new installation uses up about 3 GB, so 5 GB should be more than enough. Remember that you just need to allocate enough to install the system. If necessary, you can always grow the LV. Enter.

The recommended name for the LV that will be used as Swap is “swap.” Enter.

And the recommended size is 2 GB or 2000 MB. Enter.

For the /home LV, the recommended name is “home.” Enter.

For this tutorial, 10 GB is good enough. Enter.

All the LVs are configured. Scroll to “Finish.” Enter.

These are the partitions and LVs that we just created. The final task is to assign a mount point and file system to the LVs. Select any of the LVs as shown in the image, then press Enter.

The default file system for non-boot partitions on Ubuntu 11.04 is ext4. Best to use the default for all the LVs. For the “home” LV, the mount point is /home, for “root”, it is /. for “swap,” just select “swap.” No mount point.

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This is what the window for the home LV should look like when you are down with it. The one for root should be just about the same. Scroll to “Done setting up the partition.” Enter.

Finally! Double-check your work, scroll to “Finish partitioning and write changes to disk.” Enter. Finish the installation, and reboot.

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At every reboot, the passphrase must be specified before the computer will boot successfully. After six (6) unsuccessful attempts, …

The system will drop you to a basic shell. If you can figure out how to boot the system, bypassing the passphrase, let us know. Note: You can set as many as eight (8) disk encryption passphrases. How to manage disk encryption passphrases and key slots tells you how.

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  1. “Note this is not a graphical installer…”
    Ummm, yes, yes it is. You are using a “TUI”, a Textual UI. It is still “graphical” in the sense that the user chooses from a set menu of items and is guided through the process.

  2. passing guest

    Could you please explain the passage:

    “You might be tempted to select “Physical volume for encryption,” but the correct option is “Physical volume for LVM.”

    why is that ?

    • If you follow the instructions on the next page, you should see why that was chosen.

      • passing guest

        Okay, I read all three pages.
        Maybe I’m dumb, but I don’t see how that makes a difference.

        As far as I understand, if I follow the instructions, it will be

        LVM partition -> encrypted volume -> LVM volumes

        However, if I specify the free space as physical volume for encryption, and THEN create an LVM on top of dev_sda#_crypt (the crypto volume that results from using free space as physical volume for encryption), wouldn’t it be like that:

        encrypted volume -> LVM -> LVM Volumes

        That is, essentially, the same ?

        Just tried both in Lubuntu 12.04, and in both cases the LVM seems to end up on sda#_crypt…
        … but if I follow the tutorial to the letter, it is sda5_crypt for some reason, however, if I specify the free space as physical volume for encryption, and then specify the resultant sda#_crypt as place for LVM, the cryptovolume gets named sda2_crypt.

        No other difference seems to be present…

      • passing-guest

        So, not to be an obtrusive nosy person (I am obsessive, not obtrusive! ^_~), what are the benefits of “encryption -over- LVM” as opposed to “LVM -over- encrypted volume” ?

        Am I missing something big and obvious ?

        • I think this is a case where the installer offers two different options that essentially do the same thing. No matter which one you select, the end result seems to be the same. Don’t sweat the small stuff, though it’s always good to get these things clarified.

  3. Croatia accommodation

    Can you tell us more about this? I’d like to find out
    some additional information.

  4. Hi, excellent tutorial!
    Can someone also confirm, that – if I understand this correctly – once the partition is encrypted, there’s no need to encrypt the home folder too?

    • In a single-user system, encrypting /home after the disk has been encrypted does not really offer any meaningful security protection.

      You can, however, encrypt specific files and folders within your home directory. With that, you may then hide certain docs, so that if another person happens upon your computer when you are logged in and not around, the hidden files will remain inaccessible. But if you have the screenlock activated when you are logged in and not around, you wouldn’t have to worry too much about that.

      • Thank you. So the only security hole with an encrypted LVM installation is that /boot is installed (& is unprotected) on the local drive. Any ideas (or a guide maybe) on how to properly install /boot on a USB thumb with encrypted LVM on the internal HDD?

        I tried setting the USB drive as the /boot while partitioning, set the bootable flag, tried to set filesystem to ext4, tried it with ext2 also, but whatever I do, after start up I get dumped to grub rescue (unknown filesystem). Obviously, BIOS is set to boot first from USB. At the rescue prompt I get
        (hd0) (hd0,msdos1) (hd1) (hd1,msdos1)

        Now it seems, that grub is trying to load root also from the USB thumb, whereas the LVM is installed on hd1,msdos1.

        (As a side note, why is it called ‘msdos’ – thought I got rid of Windows for good several years ago.)

        Any ideas on how to do this properly?

        • You are obviously more paranoid (security conscious) than I am, which, btw, is a good thing, but “unprotected” /boot on the local drive is not such a big deal. I don’t think you can have it any other way, and I have not come across any case where a computer with an encrypted disk was compromised via /boot.

          There have been very recent cases in courts where defendants are being forced to surrender their encryption passphrases because persecutors could not decrypt the drive.

          Since you have /boot on a stick, the main system on the local drive, and the system is still trying to load main from the stick, you can edit GRUB to point main to the correct partition on the local drive.

          Just to be sure, hd0 is the local drive, and hd1, the USB stick, so “LVM is installed on hd1,msdos1” should not be a correct statement. Right?

          Since this is not something I have attempted before, I am not in a position to offer more practical advice on this, but it is an opportunity to try it myself. Let’s work on this together and see how we can make it work.

          • Yes, let’s, as I’m quite determined to get this to work. Through e-mail this might be easier though, can you contact me @ geophey@mailcatch.com (don’t worry, it’s a disposable address) or directly to my registered one (if you can see it)?

          • Let’s keep the discussion public, so others might benefit from it.

          • Well, I tried, and fedora works effortlessly, and with a GUI install. I haven’t found a way in Ubuntu yet.

          • Trying to get this done with Ubuntu’s installer is a pain in the neck. Canonical needs to work on Ubuntu’s graphical installer and the ncurses installer. They should take a break from trying to redefine the desktop and work to improve the installers.

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  6. Hi there, great tutorial.
    I’ve followed it like it says, but instead used the language “Portuguese From Brazil” to install.
    And when I get to the login in gnome, it doesn’t work the login.
    It just get blank, and apparently won’t start gnome.(it show at the start a the update window, and other options, but they are all with strange unicode data, it show symbols instead of special characters).
    When I loged in as root(from grub) and got to the /home/user folder it shows also the folders with this symbols instead of the regular characters.

    Is this a known bug for encrypting the hole OS or could it be because I’m running in a VM?(using virtual box).

    Thanks, and sorry for the bad english

    • Sounds more like a locale bug.

      • Yeah, it’s that.
        I instaled the en-us version and no errors at all.
        Can I just ask you guy one more question?
        My gf is trying a dual boot (xp and ubuntu) but wanted a file partition that is accessible from both OS.
        In the installation she divided the home in half and made a new FAT32, but in the mount point we got a little trouble… in the end she let the mount point as /windows.
        Is this the right way to do so?

        Thanks for the fast answer

  7. Thanks for the clear and consise tutorial, most helpful. There were a couple of screens which were not featured but I was able to guess that bit! Just waiting for it to install now! 🙂

  8. great howto, thanks

  9. Wow, very nice tutorial finid. It worked pretty flawlessly for Kubuntu 11.10 b2, though the alternative install CD evidently must actually be burned to physical CD, as USB live install couldn’t seem to get past the fact that I was installing to my HDD. Thanks again!

  10. If i want create a logical volumen with two physical volumes i need to create two passwords. Is posible create an group volumen before encrypt ?

    I’m sorry for my english. Thanks !

    • I’ve not investigated that use case, but if you refer to the image 3, counting from the top, on page 2 of the article, you are given the option to select one or more PVs to encrypt. I’m not sure about this, but I think if you have 2 PVs, the installer might allow you to specify just one password.

      Have you tried it?

  11. Very nice tuto!
    To bad that the current installation procces is already a bit different. I installed using your walk through several laptops last 2 weeks, and suprise, the new alternative cd i burned this week is different from the one from the week before, takes a few extra steps to compleet.
    Most importent, if installed on the end it asks if grub can be written on the disk, if i use a usb stick, it will write it automatically on the usb stick?!?!
    So i burned a new cd, problem solved.
    Also in the new installer there are 2 or 3 more screens where you have to say yes to writing the lv and the partitions on disk.

    thanks for the tuto!
    helped to make my life easier!

  12. Can you do this on an external drive and dual boot with Windows 7?

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