Public bug reported:

Since libvirt-daemon-hwe have the same dynamic conffiles (systemd links,
apparmor local) than libvirt-daemon-hwe

When libvirt-daemon-hwe is installed, purging libvirt-daemon might break
libvirt-daemon-hwe by removing the systemd unit links
(/etc/systemd/system/** -> /usr/lib/).

Here is the list of purge actions done by dh-helper for libvirt-daemon
in the postrm maintscript:

...
update-rc.d libvirtd remove
deb-systemd-helper purge 'libvirtd-admin.socket' 'libvirtd-ro.socket' 
'libvirtd.socket'
deb-systemd-helper purge 'libvirtd.service' >/dev/null

rm -f "/etc/apparmor.d/disable/usr.sbin.libvirtd" || true
rm -f "/etc/apparmor.d/force-complain/usr.sbin.libvirtd" || true
rm -f "/etc/apparmor.d/local/usr.sbin.libvirtd" || true
rm -f /var/cache/apparmor/*/"usr.sbin.libvirtd" || true
rmdir /etc/apparmor.d/disable 2>/dev/null || true
rmdir /etc/apparmor.d/local   2>/dev/null || true
rmdir /etc/apparmor.d         2>/dev/null || true


Reproduce
---

$ apt install libvirt-daemon
$ apt install libvirt-daemon-hwe
$ apt purge libvirt-daemon

$ systemci status libvirtd
 -> service disabled

** Affects: qemu-hwe (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Since libvirt-daemon-hwe have the same dynamic conffiles (systemd links,
  apparmor local) than libvirt-daemon-hwe
  
  When libvirt-daemon-hwe is installed, purging libvirt-daemon might break
  libvirt-daemon-hwe by removing the systemd unit links
  (/etc/systemd/system/** -> /usr/lib/).
  
  Here is the list of purge actions done by dh-helper for libvirt-daemon
  in the postrm maintscript:
  
  ...
- update-rc.d libvirtd remove 
+ update-rc.d libvirtd remove
  deb-systemd-helper purge 'libvirtd-admin.socket' 'libvirtd-ro.socket' 
'libvirtd.socket'
  deb-systemd-helper purge 'libvirtd.service' >/dev/null
  
  rm -f "/etc/apparmor.d/disable/usr.sbin.libvirtd" || true
  rm -f "/etc/apparmor.d/force-complain/usr.sbin.libvirtd" || true
  rm -f "/etc/apparmor.d/local/usr.sbin.libvirtd" || true
  rm -f /var/cache/apparmor/*/"usr.sbin.libvirtd" || true
  rmdir /etc/apparmor.d/disable 2>/dev/null || true
  rmdir /etc/apparmor.d/local   2>/dev/null || true
  rmdir /etc/apparmor.d         2>/dev/null || true
+ 
+ 
+ Reproduce
+ ---
+ 
+ $ apt install libvirt-daemon
+ $ apt install libvirt-daemon-hwe
+ $ apt purge libvirt-daemon
+ 
+ $ systemci status libvirtd
+  -> service disabled

-- 
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https://bugs.launchpad.net/bugs/2164849

Title:
  purging libvirt-daemon when libvirt-daemon-hwe is installed breaks
  libvirt-daemon-hwe

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https://bugs.launchpad.net/ubuntu/+source/qemu-hwe/+bug/2164849/+subscriptions


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