Comment 36 for bug 1758037

Upgraded
- 1.3.1-1ubuntu10.23
- 3.6.0-1ubuntu6.7
- 4.0.0-1ubuntu8.1
without issues.

Confirmed the issue affected the target release before the proposed version:
e.g.:
root@b:~# virsh start b1
error: Failed to start domain b1
error: An error occurred, but the cause is unknown

Bionic and Artful with the fix resolved the error just as expected.

Xenial is a bit more tricky.
There is another issue in Xenial not this bug here but affecting the same use case.
You'll see
libvirtd[18352]: internal error: setup of pcap handle failed: socket: Permission denied
Due to
apparmor="DENIED" operation="create" namespace="root//lxd-x_<var-snap-lxd-common-lxd>" profile="/usr/sbin/libvirtd" pid=2952 comm="libvirtd" family="packet" sock_type="raw" protocol=768 requested_mask="create" denied_mask="create"

That is fixed in latter versions and considered not important for Xenial as it is a uncommon use case and can be changed due to config-files (apparmor rule). But for now that means on Xenial one has to allow those to get the use-case working which is required to check the fix of our change of the bug in discussion here.

With that in place Xenial works as well now, and in regard to the issue fixed in this bug here working.

Per the above setting all three releases to verified.