Comment 11 for bug 1813394

The same problem occurs when the hdd is automatically decrypted with clevis and a tang server. The script /usr/share/initramfs-tools/scripts/local-bottom/clevis tries to deactivate the network interface again after it got the secret to decrypt the disk from the tang server:

...
for iface in /sys/class/net/*; do
    if [ -e "$iface" ]; then
        iface=$(basename "$iface")
        ip link set dev "$iface" down
        ip addr flush dev "$iface"
        ip route flush dev "$iface"
    fi
done

The presence of /run/net-*.conf and /run/netplan/*.yaml leads to the interface beeing managed by systemd-networkd instad of NetworkManager here, too.

Instead of implementing removal of the files in dropbear an clevis, maybe there is a single place to serve both, dropbear and clevis?