sabato 20 ottobre 2012

Ubuntu 12.04 - How to solve "The disk drive for /dev/mapper/cryptswap1 is not ready yet or not present" error at boot

This error comes up when your swap partition cannot be mounted for some reason. Your system will run and for modern systems with lots of RAM, this should not be a problem at all, but you might want to reactivate swap. If you do, it's better you do it the right way, not only by enabling swap, but also making sure that it gets encrypted, like the rest of your home directory.
The way to do it is the following, commands or files are in bold:

  • sudo swapoff -a (turns off swap)
  • comment existing swap configuration in /etc/crypttab
    cryptswap1 /dev/sdb8 /dev/urandom swap,cipher=aes-cbc-essiv:sha256
  • comment existing swap configuration in /etc/fstab

    /dev/mapper/cryptswap1 none swap sw 0 0
  • re-format swap partition with gparted as linux-swap
  • sudo mkswap /dev/sdXX (create new swap, XX depends on your system and is the partition you formatted earlier, in my case it was sdb8)
  • mark somewhere the UUID value that the previous command returns

    Setting up swapspace version 1, size = 4208636 KiB
    no label, UUID=06a9be15-d05b-466d-bfe3-a086bb9cdba0
  • update /etc/initramfs-tools/conf.d/resume with the new UUID

  • sudo update-initramfs -u (update initramfs)
  • sudo swapon /dev/sdXX (enable swap, XX depends on your setup)
  • sudo ecryptfs-setup-swap (encrypt swap)
now you can check that swap is on by using the commands 

free -m
                     total       used       free     shared    buffers     cached
Mem:         11950       6662       5287          0        126       4002
-/+ buffers/cache:       2533       9416
Swap:         4109          0       4109


swapon -s
Filename                 Type Size     Used Priority
/dev/mapper/cryptswap1                  partition       4208636 0 -1

15 commenti:

  1. Hey men... thank you so much.. It has been so useful... you saved my life...

    Congratulations it's a great tutorial.. !!

  2. gparted runs mkswap when you format linux-swap partition. You can also do swapon by gparted.

    I did the above, but I still have the error message for a short time during boot.

  3. I had the same issue. Eventually it turned out that the device in /etc/crypttab was wrong.

    The system was installed from a USB pen-drive, so during installation the pen-drive was /dev/sda and the hard disc was /dev/sdb. The swap partition was hence written into /etc/crypttab as /dev/sdb6.
    After booting from the harddrive this became /dev/sda6 and the mapper could not find it any more.

    To fix this just correct the line in /etc/crypttab to the correct /dev/sd?? or the UUID of the swap partition.

  4. Thanks, Great tutorial, worked perfectly

  5. Hi! First thanks for your tutorial, it is very clear. However I am stuck at the step: "re-format swap partition with gparted as linux-swap". I get an error when gparted run mkswap -L "" /dev/sda7 : /dev/sda7: Device or resource busy.

    Then I tried:

    lsof | grep /dev/sda7
    lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /home/noomi/.gvfs
    Output information may be incomplete.

    Before that I must say I followed a tutorial to remove /home encryption. I checked if the file /home/.encryptfs was erased but il wasn't, and I was still getting the message at boot. So I simply deleted .encryptfs...

    Here are some commands results:
    sudo blkid
    /dev/sda1: LABEL="SYSTEM" UUID="C2CE9DB7CE9DA467" TYPE="ntfs"
    /dev/sda2: UUID="DC769A88769A62D6" TYPE="ntfs"
    /dev/sda4: LABEL="SAMSUNG_REC" UUID="2EFE43CDFE438BD1" TYPE="ntfs"
    /dev/sda5: UUID="08DEFE7FDEFE647A" TYPE="ntfs"
    /dev/sda6: UUID="d61bdf5e-8819-4771-a8dc-245c96d1cb39" TYPE="ext4"
    /dev/mapper/cryptswap1: UUID="3e86a0e8-d386-4748-a299-a54be304c4d7" TYPE="swap"


    cat /etc/crypttab
    #cryptswap1 /dev/sda7 /dev/urandom swap,cipher=aes-cbc-essiv:sha256

    What should I do?

  6. Ok so just in case it might help someone, before using gparted just reboot. As you've commented the lines to use the swap in /etc/fstab, your swap partition will no longer be in use at reboot and you'll be able to edit it with gparted. Also, this link takes this step into account:

  7. Hi

    First of all. Great article, easy enough for a noob like me to understand. I was able to step through and enable swap and encryption up to the point where I can see 'swapon -s' return expected results. However, I seem to be running into the issue that the system goes back to reporting "The disk drive for /dev/mapper/cryptswap1 is not ready yet or not present" upon reboot. i.e. to say somehow the swap settings seem to get lost on reboot. Is there like a final step that I might be missing?

  8. Worked for me to get the swap working but every time I rebooted I got the "The disk drive for /dev/mapper/cryptswap1 is not ready yet or not present" message.

    I fixed this by pasting the UUID returned from the mkswap step into the /etc/fstab file thus:
    # swap was on /dev/sda6 during installation
    UUID=89977e86-a252-4a1b-9b0c-15ce3f7ab25c none swap sw 0 0
    /dev/mapper/cryptswap1 none swap sw 0 0

    Previously the UUID=.... swap line was commented out and had a different UUID present.

    Hope that helps, Nick.

  9. Thank you so much
    but unfortunately it did't work for me.
    I found this solution and it worked for me, it still give this message while booting but the swap space now available.

    sudo -s
    umount /dev/sda5 #Replace this by the swap partition used in your system!
    mkswap /dev/sda5 # Use the UUID from the output in the following line!
    echo "RESUME=UUID=143c43d8-0a77-4d62-a7ae-f53a8e0229a9" > /etc/initramfs-tools/conf.d/resume
    echo "cryptswap1 /dev/sda5 /dev/urandom swap,cipher=aes-cbc-essiv:sha256" > /etc/crypttab
    update-initramfs -u


  10. Thank you so much

  11. Hello. Thanks for the guide.
    However I still face the same problem.
    As I apply these steps, everything works fine. The swap is on and when i reboot i get no error message.
    The second time I reboot the message returns and there is no swap mounted...
    What can i do?
    Ι have repeated the whole process about 4 or 5 times.
    Thanks in advance.

  12. Thanks! Your guide helped me fix an "A start job is running for dev-disk-by..." message that was delaying the boot by 1min 30s.

    I don't really need encrypted swap, so I skipped the last step and re-configured swap manually.
    1. Get the swap partition UUID: blkid
    2. Re-enable swap in /etc/fstab:
    UUID=01234567-9abc-def0-1234-56789abcdef0 none swap sw 0 0