[Bug 1883865] [NEW] Lubuntu 18.04 doesn't boot because dbus-deamon crashes because of AppArmor

[pts]

Public bug reported:

I experienced this dbus-deamon-cannot-start-because-of-apparmor bug
right at the first boot after installing (SHA1)
`048b0b8925f1816b28e3527bfcd47d2842fa9f5e lubuntu-18.04-desktop-
amd64.iso`. Please note that the installer has downloaded some packages
files, the bug may not be in a package in the .iso. The bug made the
first boot unsuccessful, it got stuck indefinitely at the boot logo.

After some debugging in recovery mode root shell, I observed that dbus-
daemon was a zombie process, restarted by systemd every few minutes, and
crashing within a second after each restart. I was able to get this
error message:

  $ journalctl -u dbus -b -f | grep 'Failed to start message bus'
  Failed to start message bus: Error getting AppArmor context of bus: Permission denied

I observed that all systemctl commands were timing out after 60 seconds,
and systemd (strace -p 1) was repeatedly and in vain issuing a ppoll(2)
system call for reading the dbus socket, and not making any progress
with its other duties.

More details here; https://askubuntu.com/q/1250238

** Affects: dbus (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1883865

Title:
  Lubuntu 18.04 doesn't boot because dbus-deamon crashes because of
  AppArmor

Status in dbus package in Ubuntu:
  New

Bug description:
  I experienced this dbus-deamon-cannot-start-because-of-apparmor bug
  right at the first boot after installing (SHA1)
  `048b0b8925f1816b28e3527bfcd47d2842fa9f5e lubuntu-18.04-desktop-
  amd64.iso`. Please note that the installer has downloaded some
  packages files, the bug may not be in a package in the .iso. The bug
  made the first boot unsuccessful, it got stuck indefinitely at the
  boot logo.

  After some debugging in recovery mode root shell, I observed that
  dbus-daemon was a zombie process, restarted by systemd every few
  minutes, and crashing within a second after each restart. I was able
  to get this error message:

    $ journalctl -u dbus -b -f | grep 'Failed to start message bus'
    Failed to start message bus: Error getting AppArmor context of bus: Permission denied

  I observed that all systemctl commands were timing out after 60
  seconds, and systemd (strace -p 1) was repeatedly and in vain issuing
  a ppoll(2) system call for reading the dbus socket, and not making any
  progress with its other duties.

  More details here; https://askubuntu.com/q/1250238

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