Public bug reported:

After performing the release upgrade from 19.4 to 19.10, my system is no
longer booting.

After unlocking the disk encryption, the system begins loading and
freezes with:

'''
aufs aufs_fill_super:920:mount[3405]: no arg
overlayfs: missing 'lowerdir'
'''

I was able to add initcall_debug to kernel args at boot time and somehow
it gets past the error and boots to terminal login prompt only - still
no graphical UI.

Please help!

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubuntu-release-upgrader-core 1:19.10.15
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CrashDB: ubuntu
Date: Thu Mar  5 13:53:41 2020
InstallationDate: Installed on 2019-04-11 (328 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 TERM=linux
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, user)
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade eoan third-party-packages

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https://bugs.launchpad.net/bugs/1866191

Title:
  Can no longer boot after 19.10 Upgrade

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