Comment 43 for bug 1763608

LTSP booting in 18.04 has broken with the recent netplan update; I think due to this patch.

Involved steps:
1) Clients netboot from the LTSP server with something like nfsroot=xxx.

2) Initramfs-tools sets an IP (usually ipv4).

3) LTSP initramfs hooks create an overlay for the file system to make it writable, and create /etc/network/interfaces with the following contents, to prevent the IP from being removed/changed:
auto enp0s3
iface enp0se inet manual

4) Here is the regression, this version of netplan now creates /run/systemd/network/10-netplan-enp0s3.network with these contents:
[Match]
MACAddress=08:00:27:e9:33:39
Name=enp0s3

[Network]
LinkLocalAddressing=ipv6

5) systemd-networkd then sees this configuration and unassigns the interface IP, hanging the clients. I don't know if it was supposed to re-initialize the IP, but it just hangs then.

The workaround we currently use is to remove netplan from the initramfs:
rm /lib/systemd/system-generators/netplan

Could you please tell us of a better way to tell netplan not to assign an IP to the boot interface, or see if it's actually a bug in netplan?