Question

8

14.10 - Swap not available

rated 0 times [ 8] [ 0] / answers: 1 / hits: 5206 / 2 Years ago, fri, august 19, 2022, 2:31:23

My swap doesn't seem to be working. I tried to fix it but nothing I tried worked.

Here is some relevant information to troubleshoot the problem:

During install I chose to encrypt my home folder. Seems cryptswap is being used.

When I open the gnome-system-monitor it says "Swap is not available".

Here is some edited terminal output:

sudo swapon -s

(Nothing)



sudo swapon -a

swapon: stat failed /dev/mapper/cryptswap1: No such file or directory



cat /etc/fstab

# <file system> <mount point>   <type>  <options>       <dump>  <pass>

# / was on /dev/sda1 during installation

UUID=3dbb0bca-df4c-426d-a672-2e31e6683646 /               ext4    errors=remount-ro 0       1

# swap was on /dev/sda5 during installation

#UUID=ef29aae9-af0e-403c-b702-334acb1d5879 none            swap    sw              0       0

/dev/mapper/cryptswap1 none swap sw 0 0



cat /etc/crypttab

cryptswap1 UUID=ef29aae9-af0e-403c-b702-334acb1d5879 /dev/urandom swap,cipher=aes-cbc-essiv:sha256



sudo lsblk -o NAME,FSTYPE,UUID

NAME   FSTYPE UUID

sda           

├─sda1 ext4   3dbb0bca-df4c-426d-a672-2e31e6683646

└─sda5

GParted:
enter image description here

Any help is appreciated =)

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tonhorn

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2 Years ago

answered 2 Years ago fittecanap · Accepted Answer

The link necordian provided has steps that do resolve this problem (I tested on a system with RAID and encrypted home directory/swap) except 1 step is missing you need to reboot before swap becomes available. Here is what I did to get my encrypted swap partition working.

Need UUID and Device name for the swap partition to fix this on RAID system with encrypted home directory/swap:

Find Device ID using "Disks" utility:

Click the ubuntu logo in the unity toolbar and then type Disks to open disk utility.

Select the SWAP partition and the device name should be listed below.

(usually /dev/dm-# for RAID or /dev/sda# for non RAID)

On my PC with RAID it was /dev/dm-6.

Get UUID from crypttab:

cat /etc/crypttab

My /etc/crypttab:

cryptswap1 UUID=5381faa1-369c-4504-9d8d-acfc7cb69e71 /dev/urandom swap,cipher=aes-cbc-essiv:sha256

Then run the following with your swap UUID and device name:

sudo mkswap -U 5381faa1-369c-4504-9d8d-acfc7cb69e71 /dev/dm-6

Add the following text ,1024 to the swap line in /etc/crypttab directly after swap,cipher=aes-cbc-essiv:sha256 do not leave any spaces.

sudo nano /etc/crypttab

/etc/crypttab should now look similar to this:

cryptswap1 UUID=5381faa1-369c-4504-9d8d-acfc7cb69e71 /dev/urandom swap,cipher=aes-cbc-essiv:sha256,1024

Run the following command:

sudo update-initramfs -u

Reboot and your swap should now work (well it worked for me).

Try rebooting a few times to make sure it's all good.