$ sudo mkdir -p /etc/systemd/system/systemd-networkd.service.d/
$ sudo cat > /etc/systemd/system/systemd-networkd.service.d/05-enable-debugging.conf << _EOF
[Service]
Environment=SYSTEMD_LOG_LEVEL=debug$ sudo mkdir -p /etc/systemd/system/systemd-networkd.service.d/
$ sudo cat > /etc/systemd/system/systemd-networkd.service.d/05-enable-debugging.conf << _EOF
[Service]
Environment=SYSTEMD_LOG_LEVEL=debug