[Bug 1906718] [NEW] Upgrade from 18.04.5 LTS to 20.04.1 LTS fails apparmor missing files

[Dariusz.Ostolski]

Public bug reported:

Yesterday I've tried to upgrade Ubuntu 18.04.5 LTS to 20.04.1 LTS and upgrade was done but with errors. After rebooting I've got a number of errors which most annoying was:
 appstreamcli: undefined symbol: AS_APPSTREAM_METADATA_PATHS

When trying to use apt, so it wasn't possible to proceed any further.
The upgrade was done in terminal not in X Server.

Commands that I've executed. Before upgrade:

sudo apt-get update && sudo apt-get dist-upgrade
sudo apt autoremove
sudo reboot

After reboot:

do-release-upgrade -m desktop
reboot

I've tried to execute:
apt dist-upgradeapt --fix-broken install

after reboot but it also failed.

As it turned out all those problems were related to the fact that two
configuration files were missing after upgrade for app-armor:

/etc/apparmor.d/tunables/home
/etc/apparmor.d/tunables/proc

After creating them I was able to continue and fix upgrade errors.
Nevertheless I would expect that going from one LTS to another is smooth
process.

For those who also have similar problems those are contents of those
files:

root at desktop-ninja-daro:~# cat /etc/apparmor.d/tunables/proc
#    Copyright (C) 2012 Canonical Ltd.
#
#    This program is free software; you can redistribute it and/or
#    modify it under the terms of version 2 of the GNU General Public
#    License published by the Free Software Foundation.
#
# ------------------------------------------------------------------

# @{PROC} is the location where proc is mounted.
@{PROC}=/proc/


root at desktop-ninja-daro:~# cat /etc/apparmor.d/tunables/home
# ------------------------------------------------------------------
#
#    Copyright (C) 2006-2009 Novell/SUSE
#    Copyright (C) 2010 Canonical Ltd.
#
#    This program is free software; you can redistribute it and/or
#    modify it under the terms of version 2 of the GNU General Public
#    License published by the Free Software Foundation.
#
# ------------------------------------------------------------------

# @{HOME} is a space-separated list of all user home directories. While
# it doesn't refer to a specific home directory (AppArmor doesn't
# enforce discretionary access controls) it can be used as if it did
# refer to a specific home directory
@{HOME}=@{HOMEDIRS}/*/ /root/

# @{HOMEDIRS} is a space-separated list of where user home directories
# are stored, for programs that must enumerate all home directories on a
# system.
@{HOMEDIRS}=/home/

# Also, include files in tunables/home.d for site-specific adjustments to
# @{HOMEDIRS}.
#include <tunables/home.d>

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

** Attachment added: "dist-upgrade.tar.gz"
   https://bugs.launchpad.net/bugs/1906718/+attachment/5440743/+files/dist-upgrade.tar.gz

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https://bugs.launchpad.net/bugs/1906718

Title:
  Upgrade from 18.04.5 LTS to 20.04.1 LTS fails apparmor missing files

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Yesterday I've tried to upgrade Ubuntu 18.04.5 LTS to 20.04.1 LTS and upgrade was done but with errors. After rebooting I've got a number of errors which most annoying was:
   appstreamcli: undefined symbol: AS_APPSTREAM_METADATA_PATHS

  When trying to use apt, so it wasn't possible to proceed any further.
  The upgrade was done in terminal not in X Server.

  Commands that I've executed. Before upgrade:

  sudo apt-get update && sudo apt-get dist-upgrade
  sudo apt autoremove
  sudo reboot

  After reboot:

  do-release-upgrade -m desktop
  reboot

  I've tried to execute:
  apt dist-upgradeapt --fix-broken install

  after reboot but it also failed.

  As it turned out all those problems were related to the fact that two
  configuration files were missing after upgrade for app-armor:

  /etc/apparmor.d/tunables/home
  /etc/apparmor.d/tunables/proc

  After creating them I was able to continue and fix upgrade errors.
  Nevertheless I would expect that going from one LTS to another is
  smooth process.

  For those who also have similar problems those are contents of those
  files:

  root at desktop-ninja-daro:~# cat /etc/apparmor.d/tunables/proc
  #    Copyright (C) 2012 Canonical Ltd.
  #
  #    This program is free software; you can redistribute it and/or
  #    modify it under the terms of version 2 of the GNU General Public
  #    License published by the Free Software Foundation.
  #
  # ------------------------------------------------------------------

  # @{PROC} is the location where proc is mounted.
  @{PROC}=/proc/

  
  root at desktop-ninja-daro:~# cat /etc/apparmor.d/tunables/home
  # ------------------------------------------------------------------
  #
  #    Copyright (C) 2006-2009 Novell/SUSE
  #    Copyright (C) 2010 Canonical Ltd.
  #
  #    This program is free software; you can redistribute it and/or
  #    modify it under the terms of version 2 of the GNU General Public
  #    License published by the Free Software Foundation.
  #
  # ------------------------------------------------------------------

  # @{HOME} is a space-separated list of all user home directories. While
  # it doesn't refer to a specific home directory (AppArmor doesn't
  # enforce discretionary access controls) it can be used as if it did
  # refer to a specific home directory
  @{HOME}=@{HOMEDIRS}/*/ /root/

  # @{HOMEDIRS} is a space-separated list of where user home directories
  # are stored, for programs that must enumerate all home directories on a
  # system.
  @{HOMEDIRS}=/home/

  # Also, include files in tunables/home.d for site-specific adjustments to
  # @{HOMEDIRS}.
  #include <tunables/home.d>

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