If you’re having trouble downloading images and/or see Unknown errors when trying to multipass launch -vvv, Little Snitch may be interfering with multipassd's network access (ref.
Little Snitch - defaults are good, it should permit mDNSResponder and bootpd access to BPF. It’s ok to block incoming connections to “multipassd” however. Blocking all incoming connections prevents a DHCP server from running locally, to give an IP to the instance. If so it must not “Block all incoming connections”. Troubleshooting ( section to be expanded) Unable to determine IP address usually implies some networking configuration is incompatible, or there is interference from a Firewall or VPN. extra IPs not reachable between instances. 
multipass shell works but the instance cannot connect to the internet. custom DHCP server bound to port 67? (“sudo lsof -iUDP:67 -n -P” should show launchd & bootpd only). another dnsmasq process bound to localhost port 53. dnscrypt-proxy/dnscrypt-wrapper/cloudflared-proxyĭefault configuration binds to localhost port 53, clashing with Internet Sharing. Cisco Umbrella Roaming Client it binds to localhost:53 which clashes with Internet Sharing, breaking instance’s DNS (ref: Umbrella Roaming Client OS X and Internet Sharing). Possible culprits: OpenVPN, F5, Dell SonicWall, Cisco An圜onnect, Citrix/Netscaler Gateway, Jupiter Junos Pulse / Pulse Secure. VPN software can be aggressive at managing routes, and may route 192.168.64 subnet through the VPN interface, instead of keeping it locally available. In the background, it will still be enabled to support instances. Note that according to “System Preferences” -> “Sharing”, the "Internet Sharing"service can appear disabled - this is ok. provide DHCP and DNS resolution on this switch at 192.168.64.1 (via bootpd & mDNSResponder services running on the host) this is configured by an auto-generated file /etc/ist - but editing this is pointless as MacOS re-generates it as it desires. create a virtual switch and connects each instance to it (subnet 192.168.64.*). 
On creation of an instance, amework on the host uses MacOS’ “Internet Sharing” mechanism to This framework manages the networking stack for the instances. Multipass uses “hyperkit” to run instances, which utilises MacOS’ amework. Possible other option - configure Multipass to use a different subnet?.Tools known to interfere with Multipass.
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