Comment 2 for bug 1670336

I patched ecryptfs-setup-swap and now it works.
The first modification is to avoid to run udevadm on a file (you get a "device node not found" error, harmless but annoying)
The second modification is to put filename instead of UUID in /etc/crypttab if you have a swap file and not a swap partition.
The third modification is to actually restart cryptdisk, since "/etc/init.d/cryptdisks restart" does nothing (see http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/vivid/cryptsetup/vivid/view/head:/debian/cryptdisks.init ), the right command is "systemctl restart cryptsetup.target"