Hi,
I'm having some slow boot problems (on xubuntu 15.04). In the /var/log/boot.log file I found the following:
Timed out waiting for device dev-disk-by\x2duuid-e04af964\x2d66f7\x2d4585\x2d8b12\x2d4e4fdf358967.device.
Dependency failed for Cryptography Setup for cryptswap1.
Dependency failed for Encrypted Volumes.
Dependency failed for /dev/mapper/cryptswap1.
Dependency failed for Swap.