As configured on install (at least in 24.8.4 I installed), the netplan config files try to manage all networking interfaces - which breaks the virtual bridge interfaces that containers and VM managers like Podman, Docket, etc create and use.
See https://github.com/moby/moby/issues/40217#issuecomment-2041628162 for more information
If networkctl shows podman* or veth* as managed then this is probably the problem breaking your container networking.
To work around this issue, I modified the file /etc/netplan/10-dhcp-all-interfaces.yaml to only manage en* interfaces rather than all interfaces, followed by netplan apply.
# Added by Armbian
#
# Reference: https://netplan.readthedocs.io/en/stable/netplan-yaml/
#
# Let systemd-networkd manage all Ethernet devices on this system, but be configured by Netplan.
network:
version: 2
renderer: networkd
ethernets:
all-eth-interfaces:
match:
name: "en*"
dhcp4: yes
dhcp6: yes
ipv6-privacy: yes # Enabled by default on most current systems, but networkd currently doesn't enable IPv6 privacy by default, see https://man.archlinux.org/man/systemd.network.5
lo-interface:
match:
name: lo
dhcp4: yes
dhcp6: yes
ipv6-privacy: yes # Enabled by default on most current systems, but networkd currently doesn't enable IPv6 privacy by default, see https://man.archlinux.org/man/systemd.network.5
Note: netplan doesn't support globs/etc on name line yet hence the need for two ethernets entries, see https://github.com/canonical/netplan/pull/202
