[Bug 1817689] Re: [16.04.6 Desktop] Cannot log in after installation with encrypted home enabled

[Łukasz Zemczak]

So apparently right before the adduser call in user-setup (and also
right after it), /sys/fs/ecryptfs/version on target is readable and
correct. However, Laney noticed through debugging right after adduser
runs that in fact the ecryptfs tools are not able to read the version
number anyway. There seems to be something strange going on in it's
get_version() function?

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Title:
  [16.04.6 Desktop] Cannot log in after installation with encrypted home
  enabled

Status in ubiquity package in Ubuntu:
  Confirmed
Status in ubiquity source package in Xenial:
  Confirmed

Bug description:
  Ubuntu Desktop 16.04.6 20190222

  Test Case
  Do an entire disk installation and on the 'Who are you' page select "encrypt home", reboot and log in from lightdm

  Actual Result
  The log in is rejected. There are permission denied in the logs (journal attached)

  This is a *regression* in 16.04.6. It works fine on 16.04.5.

  The following message appears in the logs:
  """"
  user-setup: Error: Your kernel does not support filename encryption
  user-setup: ERROR:  Could not add passphrase to the current keyring
  user-setup: adduser: `/usr/bin/ecryptfs-setup-private -b -u u' returned error code 1. Exiting.
  """"

  This is with kernel 4.15.0-45-generic
  16.04.5 uses kernel 4.15.0-29-generic

  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 4.15.0-45.48~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-45-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Tue Feb 26 06:10:00 2019
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd quiet splash ---  apt-setup/restricted=false apt-setup/multiverse=false
  InstallationDate: Installed on 2019-02-26 (0 days ago)
  InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release amd64 (20190222)
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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