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

[Iain Lane]

That function does some interesting stuff to find out where a sysfs is
mounted. It's broken because for some reason (don't know why), /proc
isn't mounted inside the chroot when we run adduser.

AFAICT user-setup is wrong here though - it calls adduser which calls
into ecryptfs. It ensures /sys is mounted but not /proc.

I don't know what was making this work before. I'm proposing to fix this
directly and not track that down since it seems fairly clear that user-
setup is buggy in this respect anyway.

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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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