Comment 17 for bug 953875

I've got a clean install of Ubuntu 14.04, amd64 here and the same issue came up - no swap being mounted although the boot drive (an SSD) has tree partitions (all created during install): the main partition /dev/sda1 and two smaller ones /dev/sda3, /dev/sda5 , one of the smaller ones /dev/sda5 being identified as swap space.

UUIDs in crypttab and fstab (the commented out one) and the other one don't match.

Fix was:
Use "drive name" instead of UUID in crpyttab.
Replaced UUID in crpyttab with /dev/sda5 and after a reboot, swap was there. So the issue seems to be that the UUID of the swap is being overwritten each time on boot and changes (there's a fix for that, with offset=0, somewhere in bugs here).