A common environment is IPv6 only with compatibility to IPv4 networks provided by NAT64, which includes the Mythic Beasts Raspberry Pi cloud and various IPv6 only VM offerings. In this environment IPv4 only services (e.g. api.snapcraft.io) have IPv6 addresses synthesized to allow connectivity. e.g. $ telnet api.snapcraft.io 443 Trying 2a00:1098:0:80:1000:3a:5bbd:5c26... Connected to api.snapcraft.io. The snap installer appears to ignore this connectivity option and insist on using IPv4 which won't work and doesn't fallback (or better yet, start with) native IPv6. $ sudo snap install canonical-livepatch error: cannot install "canonical-livepatch": persistent network error: Post https://api.snapcraft.io/v2/snaps/refresh: dial tcp 91.189.92.20:443: connect: network is unreachable IPv6 + NAT64 is the required to be supported for iOS applications.