Comment 25 for bug 953875

I edited /usr/bin/ecryptfs-setup-swap and replaced the line:
   echo "cryptswap$i UUID=$uuid /dev/urandom swap,cipher=aes-cbc-essiv:sha256" >> /etc/crypttab
with:
    echo "cryptswap$i $swap /dev/urandom swap,cipher=aes-cbc-essiv:sha256" >> /etc/crypttab

Then I ran (in Virtualbox) ecryptfs-setup-swap, then rebooted.
Sometimes the encrypted swap was successfully mounted.
Other times a message appeared during boot complaining that the cryptswap1 was not ready yet (or something), and the swap was not mounted. In that case, running "sudo cryptdisks_stop" and "sudo cryptdisks_start" would mount the swap.
Interestingly, the failures happened randomly in my Xubuntu 14.04 virtual machine, but never happened in my Kubuntu 14.04 virtual machine (didn't test in the actual Ubuntu).

So, it's something!
Note: without editing the file, "sudo cryptdisks_start" would throw an error, so the edit is necessary.