Ubuntu 12.04 - How to solve "The disk drive for /dev/mapper/cryptswap1 is not ready yet or not present" error at boot
原文地址：
http://punygeek.blogspot.com/2012/10/ubuntu-1204-how-to-solve-disk-drive-for.html
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
ex.
cryptswap1 /dev/sdb8 /dev/urandom swap,cipher=aes-cbc-essiv:sha256comment existing swap configuration in /etc/fstab
ex.
/dev/mapper/cryptswap1 none swap sw 0 0re-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
ex.
Setting up swapspace version 1, size = 4208636 KiB
no label, UUID=06a9be15-d05b-466d-bfe3-a086bb9cdba0update /etc/initramfs-tools/conf.d/resume with the new UUID
ex.
RESUME=UUID=06a9be15-d05b-466d-bfe3-a086bb9cdba0sudo update-initramfs -u (update initramfs)
sudo swapon /dev/sdXX (enable swap, XX depends on your setup)
sudo ecryptfs-setup-swap (encrypt swap)