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[SRU Justification]
A regression in initramfs-tools causes it to autogenerate config in the 
initramfs saying to resume from any available swap devices, even if the swap 
device is ephemeral (i.e. swap encrypted with a random key).  This adds an 
inappropriate 30-second boot delay to any system with randomly-crypted swap, 
which includes any system that was installed with encrypted home directories in 
earlier releases.

[Test case]
1. Install the ecryptfs-utils package.
2. Enable encrypted swap by running 'sudo ecryptfs-setup-swap'.
3. Run 'update-initramfs -u' to regenerate the initramfs.
4. Reboot.
5. Verify that dmesg shows a 30-second delay before mounting the root 
6. Install initramfs-tools from bionic-proposed.
7. Reboot.
8. Verify that dmesg no longer shows a 30-second delay before mounting the root 

[Regression potential]
This makes changes to shell scripts, and shell is a perilous language.  An 
unnoticed bug could cause all initramfs generation, and thus all kernel 
installation, to fail for some users.  A regression could also cause a user to 
lose hiberation support that they currently have.

[Original description]
Since upgrade to Bionic ubuntu is hanging at boot for about 30s. A `dmesg` shows

[    3.407230] clocksource: Switched to clocksource tsc
[   34.632583] EXT4-fs (sda2): mounted filesystem with ordered data mode. Opts: 

This is 100% reproducable and is always 30s minimum. I do not know in
which package to report this properly – please excuse me.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.17
ProcVersionSignature: Ubuntu 4.15.0-20.21-lowlatency 4.15.17
Uname: Linux 4.15.0-20-lowlatency x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: i3
Date: Fri May 18 09:40:59 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-06-03 (1444 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to bionic on 2018-05-13 (5 days ago)
 Error: command ['pkexec', 'cat', 
'/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 
127: polkit-agent-helper-1: error response to PolicyKit daemon: 
GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
 Error executing command as another user: Not authorized

 This incident has been reported.

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: Fix Committed

** Tags: amd64 apport-bug bionic dist-upgrade xenial2bionic
hanging at boot for about 30 seconds since upgrade to bionic
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