Libvirt failing to launch Ubuntu core instances

[luis4a0]

Describe the bug
The Libvirt driver does not launch Ubuntu core instances.

To Reproduce

$ multipass launch core22
launch failed: The following errors occurred:                                   
planetary-mutt: timed out waiting for response

Expected behavior
This must work as it does in QEMU.

Logs
The log is full of messages like these:

may 30 15:48:45 poseidon audit[164025]: AVC apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:46 poseidon audit[164025]: AVC apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:46 poseidon audit[164025]: AVC apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:46 poseidon audit[164025]: AVC apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:47 poseidon audit[164025]: AVC apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="prio-rpc-libvir" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:47 poseidon audit[164025]: AVC apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:47 poseidon audit[164025]: AVC apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:47 poseidon kernel: kauditd_printk_skb: 5 callbacks suppressed
may 30 15:48:47 poseidon kernel: audit: type=1400 audit(1685472527.954:5209): apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="prio-rpc-libvir" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:47 poseidon kernel: audit: type=1400 audit(1685472527.954:5210): apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"
may 30 15:48:47 poseidon kernel: audit: type=1400 audit(1685472527.954:5211): apparmor="DENIED" operation="ptrace" class="ptrace" profile="libvirtd" pid=164025 comm="rpc-libvirtd" requested_mask="read" denied_mask="read" peer="snap.multipass.multipassd"

Additional info

• OS: Ubuntu 23.04
• multipass version: 1.11.0
• multipass info --all
• multipass get local.driver: libvirt

[ricab]

Similar to #1955.