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the tag 'verification-needed-disco' to 'verification-failed-disco'.

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** Tags added: verification-needed-disco

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https://bugs.launchpad.net/bugs/1824812

Title:
  apparmor does not start in Disco LXD containers

Status in AppArmor:
  Triaged
Status in apparmor package in Ubuntu:
  Fix Released
Status in libvirt package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Disco:
  Fix Committed

Bug description:
  In LXD apparmor now skips starting.

  Steps to reproduce:
  1. start LXD container
    $ lxc launch ubuntu-daily:d d-testapparmor
    (disco to trigger the issue, cosmic as reference)
  2. check the default profiles loaded
    $ aa-status

  => This will in cosmic and up to recently disco list plenty of profiles 
active even in the default install.
  Cosmic:
    25 profiles are loaded.
    25 profiles are in enforce mode.
  Disco:
    15 profiles are loaded.
    15 profiles are in enforce mode.

  All those 15 remaining are from snaps.
  The service of apparmor.service actually states that it refuses to start.

  $ systemctl status apparmor
  ...
  Apr 15 13:56:12 testkvm-disco-to apparmor.systemd[101]: Not starting AppArmor 
in container

  I can get those profiles (the default installed ones) loaded, for example:
    $ sudo apparmor_parser -r /etc/apparmor.d/sbin.dhclient
  makes it appear
    22 profiles are in enforce mode.
     /sbin/dhclient

  I was wondering as in my case I found my guest with no (=0) profiles loaded. 
But as shown above after "apparmor_parser -r" and package install profiles 
seemed fine. Then the puzzle was solved, on package install they
  will call apparmor_parser via the dh_apparmor snippet and it is fine.

  To fully disable all of them:
    $ lxc stop <container>
    $ lxc start <container>
    $ lxc exec d-testapparmor aa-status
  apparmor module is loaded.
  0 profiles are loaded.
  0 profiles are in enforce mode.
  0 profiles are in complain mode.
  0 processes have profiles defined.
  0 processes are in enforce mode.
  0 processes are in complain mode.
  0 processes are unconfined but have a profile defined.

  That would match the service doing an early exit as shown in systemctl
  status output above. The package install or manual load works, but
  none are loaded by the service automatically e.g. on container
  restart.

  --- --- ---

  This bug started as:
  Migrations to Disco trigger "Unable to find security driver for model 
apparmor"

  This most likely is related to my KVM-in-LXD setup but it worked fine
  for years and I'd like to sort out what broke. I have migrated to
  Disco's qemu 3.1 already which makes me doubts generic issues in qemu
  3.1 in general.

  The virt tests that run cross release work fine starting from X/B/C but all 
those chains fail at mirgating to Disco now with:
    $ lxc exec testkvm-cosmic-from -- virsh migrate --unsafe --live 
kvmguest-bionic-normal
    qemu+ssh://10.21.151.207/system
    error: unsupported configuration: Unable to find security driver for model 
apparmor

  I need to analyze what changed

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