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[Hadmut Danisch <hadmut@xxxxxxxxxx>]

More info from the source code of systemd-cryptsetup:


 else if (streq(option, "luks"))
                arg_type = CRYPT_LUKS1;
...
 } else if (STR_IN_SET(option, "plain", "swap", "tmp"))
                arg_type = CRYPT_PLAIN;


so the swap argument overwrites the luks argument and resets the ecryption type to plain. 


And indeed, when using

/lib/systemd/systemd-cryptsetup attach sda2_crypt /dev/sda2 none
swap,luks,discard


(i.e. just change the order of the parameters,  use   swap,luks,discard   instead of  luks, swap, discard , as the ubuntu installer creates, it works and uses the luks partition correctly.

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https://bugs.launchpad.net/bugs/1506139

Title:
  15.10beta crashes encrypted swap partition

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  I'm usually using a setup with three partitions on a disk

  Partition 1:  plain ext4 boot partition mounted on  /boot
  Partition 2:  luks-encrypted swap
  Partition 3: luks-encrypted btrfs for /  /home ...

  both mentioned in /etc/crypttab like

  sda2_crypt UUID=a7976d5c-6191-436d-9cf9-2cedf17d0893 none luks,swap,discard
  sda3_crypt UUID=339b9a90-8292-422d-a3cf-eeb0317e9f84 none luks,discard

  
  With several machines I have installed 15.10 beta on and in several cases I experienced the problem that the swap is not activated at boot time and that /dev/disks/by-uuid does not contain a link to the swap partition, and the previously created luks-encrypted swap is destroyed after boot: It is not a luks partition anymore and filled with random (presumably encrypted) bytes without structure. 

  I first thought that this is a problem of the setup process, and
  repaired the swap manually. But then I found the partition destroyed
  again. This happend several times on several machines.

  I am not sure yet what exactly would destroy the partition.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: cryptsetup 2:1.6.6-5ubuntu2
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Oct 14 18:12:58 2015
  InstallationDate: Installed on 2015-10-08 (5 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  crypttab:
   sda2_crypt UUID=a7976d5c-6191-436d-9cf9-2cedf17d0893 none luks,swap,discard
   sda3_crypt UUID=339b9a90-8292-422d-a3cf-eeb0317e9f84 none luks,discard

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