Comment 5 for bug 362315

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Scott James Remnant (Canonical) (canonical-scott) wrote : Re: udev fails to identify crypt_LUKS swap partition by uuid

Please don't simply re-open bugs without consulting with the maintainer.

In your case, my understanding of cryptsetup is that it creates a devmapper device exposing the *unencrypted* data on the partition. It is quite correct that udev ignores /dev/sda4 - it is an encrypted swap, and udev can do nothing with it.

Instead you should use the UUID of the actual unencrypted devmapper device. What does ls -l /dev/mapper show for you?