Hi Deltik (dupped onto this), Sebastian and Ultrabit.

I checked this case a bit deeper and I no more think it is a dup, it really 
might be a new issue.
You are not using zfs/lvm pools, but just "lvm/zfs disks" which is fine and 
should work.
Lets work together to resolve the issue soon.

We have the following data right now:

Two cases: lvm / zfs
For both we know that they partially work with symlinks in devfs.

For the ZFS Case we have an example:
  apparmor="DENIED" operation="open" name="/dev/zd80"
Leads to:
 Could not open '/dev/zvol/rpool/demo-vm': Permission denied
And /dev/zvol/rpool/demo-vm` is a symbolic link to `/dev/zd80

I very much assume that the LVM case is very much the same (they share a
lot of code and it seems an odd incident that it hits on the same
update.

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https://bugs.launchpad.net/bugs/1756394

Title:
  Upgrading libvirt from 4.0.0-1ubuntu4 to 4.0.0-1ubuntu5 introduced a
  permission denied on device error

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