[Bug 1453738] Re: installer in LVM mode sets up broken encrypted swap, using duplicate unencrypted swap

[Dustin Kirkland ]

Please, please, please disable swap entirely on Ubuntu (wily) or later,
and instruct people to 'sudo apt-get install swapspace' if they simply
can't live without swap.

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https://bugs.launchpad.net/bugs/1453738

Title:
  installer in LVM mode sets up broken encrypted swap, using duplicate
  unencrypted swap

Status in eCryptfs:
  New
Status in ecryptfs-utils package in Ubuntu:
  Triaged
Status in ecryptfs-utils source package in Trusty:
  Triaged
Status in ecryptfs-utils source package in Utopic:
  Triaged
Status in ecryptfs-utils source package in Vivid:
  Triaged
Status in ecryptfs-utils source package in Wily:
  Triaged

Bug description:
  When installing Ubuntu with "Use LVM" (but not encryption!), and
  "encrypt my home dir", the installer adds the original unencrypted
  swap to fstab. Then, ecryptfs-setup-swap keeps that, and additionally
  configures an encrypted swap via an UUID and without offset (which
  would trigger bug 953857 again!), so that you end up with *two* swap
  configs for one and the same partition, once unencrypted and once
  encrypted:

  fstab:
  /dev/mapper/ubuntu--vg-swap_1 none swap sw 0 0
  /dev/mapper/cryptswap1 none swap sw 0 0

  crypttab:
  cryptswap1 UUID=f636d7ef-9405-482d-a90a-5ba67026fcfb /dev/urandom swap,offset=1024,cipher=aes-xts-plain64

  (UUID is for ubuntubuntu--vg-swap_1). This can't work, as the
  unencrypted one is faster, so trying to set up the encrypted one
  fails.

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