Comment 21 for bug 1453738

Bruno's situation is very similar:

blkid:
/dev/mapper/ubuntu--vg-swap_1: UUID="f636d7ef-9405-482d-a90a-5ba67026fcfb" TYPE="swap"

fstab:
/dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0
/dev/mapper/cryptswap1 none swap sw 0 0

crypttab:
cryptswap1 UUID=f636d7ef-9405-482d-a90a-5ba67026fcfb /dev/urandom swap,offset=1024,cipher=aes-xts-plain64

This just simply can't work.