Three way check on fresh installs:
dpkg -S $((find /etc/apparmor.d/ -name '*libvirt*' && find /etc/apparmor.d/ 
-name '*TEMPLATE*' )| xargs) | sort
X                                                           Y                   
                                                        X-Y upgrade
libvirt-bin: /etc/apparmor.d/abstractions/libvirt-lxc       
libvirt-daemon-system: /etc/apparmor.d/abstractions/libvirt-lxc             
libvirt-daemon-system: /etc/apparmor.d/abstractions/libvirt-lxc
libvirt-bin: /etc/apparmor.d/abstractions/libvirt-qemu      
libvirt-daemon-system: /etc/apparmor.d/abstractions/libvirt-qemu            
libvirt-daemon-system: /etc/apparmor.d/abstractions/libvirt-qemu
libvirt-bin: /etc/apparmor.d/libvirt                        
libvirt-daemon-system: /etc/apparmor.d/libvirt                              
libvirt-daemon-system: /etc/apparmor.d/libvirt
libvirt-bin: /etc/apparmor.d/libvirt/TEMPLATE.lxc           
libvirt-daemon-system: /etc/apparmor.d/libvirt/TEMPLATE.lxc                 
libvirt-daemon-system: /etc/apparmor.d/libvirt/TEMPLATE.lxc
libvirt-bin: /etc/apparmor.d/libvirt/TEMPLATE.qemu          
libvirt-daemon-system: /etc/apparmor.d/libvirt/TEMPLATE.qemu                
libvirt-daemon-system: /etc/apparmor.d/libvirt/TEMPLATE.qemu
                                                            
libvirt-daemon-system: /etc/apparmor.d/local/usr.lib.libvirt.virt-aa-helper 
libvirt-daemon-system: /etc/apparmor.d/local/usr.lib.libvirt.virt-aa-helper
libvirt-bin: /etc/apparmor.d/local/usr.sbin.libvirtd        
libvirt-daemon-system: /etc/apparmor.d/local/usr.sbin.libvirtd              
libvirt-daemon-system: /etc/apparmor.d/local/usr.sbin.libvirtd
libvirt-bin: /etc/apparmor.d/usr.lib.libvirt.virt-aa-helper 
libvirt-daemon-system: /etc/apparmor.d/usr.lib.libvirt.virt-aa-helper       
libvirt-daemon-system: /etc/apparmor.d/usr.lib.libvirt.virt-aa-helper
libvirt-bin: /etc/apparmor.d/usr.sbin.libvirtd              
libvirt-daemon-system: /etc/apparmor.d/usr.sbin.libvirtd                    
libvirt-daemon-system: /etc/apparmor.d/usr.sbin.libvirtd

In this case Y and the X-Y upgrade was equal.
Also the formerly missing TEMPLATE files were here.
Note that I still have that cae on my phys box - no matter how often I 
reinstall.

Checking content between X and Y:
Equal:
5f6aa836ced6b474dabfce46a8bfb5e4  /etc/apparmor.d/libvirt/TEMPLATE.lxc
b0dfa704c6297fd9a4e68f0137c6be88  /etc/apparmor.d/libvirt/TEMPLATE.qemu
7166fa490aaf905b7f71cb5407ef0696  /etc/apparmor.d/local/usr.sbin.libvirtd
No functional diff (only comments/reordering):
/etc/apparmor.d/abstractions/libvirt-lxc
/etc/apparmor.d/abstractions/libvirt-qemu
/etc/apparmor.d/usr.lib.libvirt.virt-aa-helper
New but non-functional (empty to carry overwrites)
/etc/apparmor.d/local/usr.lib.libvirt.virt-aa-helper
Changed:
/etc/apparmor.d/usr.sbin.libvirtd added "/usr/sbin/virtlogd pix"

Here the easy in container test stops, as the apparmor security driver really 
can't work in there.
I need to go back to my BM system and understand/fix why it does run into 
"error: unsupported configuration: Unable to find security driver for model 
apparmor" now.
While only partially related I still wanted to document here to find it later 
if needed

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https://bugs.launchpad.net/bugs/1633207

Title:
  VM fails to start with dac security driver added

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