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[Hadmut Danisch <hadmut@xxxxxxxxxx>]

> From your description it sounds like something is destroying sda3
itself (i. e. the outer encrypted LUKS partition), *not* the unencrypted
sda3_crypt, right?

Right.

I've created the partitions with the graphical xubuntu installer from
xubuntu 15.10 beta 1 cdrom put on a usb stick, and created both sda2 and
sda3 as encrypted volumes, then put a swap in sda2_encrypted and btrfs
in sda3_encrypted. This worked well with 14.04.

After booting I've realized that the machine had no swap, even no links
to the partition under /dev/disks/by-uuid, and thus could not open the
device manually.

I found that the partition was completely filled with random data, no
luks header. cryptsetup isLuks said it is not a luks device, and xxd
should no trace of a luks header anymore, completely overwritten.

I assumed it was a problem of the installer, not of the running system.
My first suspicion was a corrupted partition table, but I did not find
any problem with the partition itself. My next suspicion was a fault in
the storage device, since I had replaced the old hard disk with a brand
new SSD for the fresh install, but except from that problem I do not see
any problems with storage, and I experienced these problems on two
distinct machines. I do not see any problems on the other partitions and
their file systems so far.




> - What do you precisely do to "repair the swap manually"?

cryptsetup luksFormat -c aes-xts-plain64 -s 512 /dev/sda2      (and enter the same password as for the root partition sda3)
cryptsetup luksOpen /dev/sda2 xxx
mkswap /dev/mapper/xxx

On one of the two machines (office machine, I'm using right now) this
helped and the problem did not reoccur so far. That's why I first
assumed that it was just a problem of the installation process
(graphical xubuntu installer), because I had experienced more trouble
with the installer used in the lubuntu 15.10 beta cdrom image.

I did the very same thing at my machine at home, also ran into that
problem, again assumed that it was a problem of the xubuntu installer,
fixed it as described above, but it reoccured. (Meanwhile there's more
trouble with this machine, systemd hangs in the boot process, except
when I open an emergency root session.)

>- After that, please copy&paste the output of ...

I'll reply to that once I am back home at that particular machine.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
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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