If you installed Ubuntu 14.04 afresh, and selected home folder encryption, you will also get an encrypted swap partition. However, when the computer boots, you get the following error message:
the disk drive for /dev/mapper/cryptswap1 is not ready yet or not present.
Note that you need to have a proper data backup and make sure you understand what you are doing.
This indicates that Ubuntu cannot find the swap partition and is not able to use it. I am very sure on my system, this partition was /dev/sda10. You can find out with:
sudo blkid | grep swap <enter>
To overcome above error or to make sure your swap partition is encrypted, open a terminal window and do the following steps:
Turn off all swap partitions
sudo swapoff -a <enter>
Close swap partition if it uses LUKS
sudo cryptsetup luksClose /dev/mapper/cryptswap1 <enter>
Turn off swap partition
sudo swapoff /dev/mapper/cryptswap1 <enter>
Create and format a LUKS partition for swap on /dev/sda10
sudo cryptsetup luksFormat --cipher aes-xts-plain64 --verify-passphrase --key-size 256 /dev/sda10 <enter>
Open the encrypted partition
sudo cryptsetup luksOpen /dev/sda10 cryptswap1 <enter>
Make the swap partition on cryptswap1
sudo mkswap /dev/mapper/cryptswap1 <enter>
Activate swap partitions
sudo swapon --all <enter>
Lists the swap partition information
sudo swapon --summary <enter>
vi /etc/crypttab <enter>
Insert line cryptswap1 /dev/sda10 none luks
Remark all other lines
Set up hibernation
sudo vi /etc/initramfs-tools/conf.d/resume <enter>
Insert line RESUME=/dev/mapper/cryptswap1
Save the file.
sudo update-initramfs -u -k all <enter>
Reboot the computer, enter your swap encrypted password and verify the swap partition has been encrypted.