[Bug 1802617] Re: After upgrade to 18.10 boot fails on waiting for encrypted source device

[Neven Luetic]

First, besides the active swapfile, that caused the trouble, I found an
additional uncommented line in my fstab, referencing /dev/mapper/yoga
--vg-swap_1. Whether this was used before or is just a relict I cannot
tell.

So I went with /dev/mapper/cryptswap1, which was active; also checked
that the device really exists in /dev/mapper.

To not lose encrypted swap, I followed the advice from #10:
* uncommented swap in /etc/fstab and /etc/crypttab
* rebooted
* restored the uncommented lines
* update-initramfs -c
* update-grub

After this I could reboot without issues.

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https://bugs.launchpad.net/bugs/1802617

Title:
  After upgrade to 18.10 boot fails on waiting for encrypted source
  device

Status in cryptsetup package in Ubuntu:
  Confirmed

Bug description:
  After upgrading from 18.04.1 LTS to 18.10, all reboots of the system
  give a boot screen with the error:

  "cryptsetup: Waiting for encrypted source device /swapfile..."

  After a minute or so, the graphical boot screen with that message is
  replaced with a console screen reading:

  "ALERT! encrypted source device /swapfile does not exist, can't unlock cryptswap1.
  Check cryptopts=source= bootarg: cat /proc/cmdline
  or missing modules, devices: cat /proc/modules; ls /dev

  Dropping to a shell

  BusyBox v1.27.2 (Ubuntu 1:1.27.2-2ubuntu4) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  (initramfs) _"

  Typing exit at the initramfs prompt gets the boot to continue. The
  boot continues to a working system and graphical login.

  The system was configured in 18.04.1 LTS to have encrypted home
  directories and no swap file.

  It looks like the /etc/fstab got a new swapfile line somewhere during
  the upgrade process. However, commenting that out and rebooting does
  not affect this issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: ubuntu-release-upgrader-core 1:18.10.11.1
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Fri Nov  9 20:22:09 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2017-08-12 (454 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: dist-upgrade
  UpgradeStatus: Upgraded to cosmic on 2018-11-09 (0 days ago)
  VarLogDistupgradeTermlog:

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