https://www.wabks.com/post/615.html

1，安裝ifupdown、resolvconf 軟體包
apt install ifupdown resolvconf

2, 修改/etc/network/interfaces檔案配置網路連線

root@bks:~# cat /etc/network/interfaces
# ifupdown has been replaced by netplan(5) on this system.  See
# /etc/netplan for current configuration.
# To re-enable ifupdown on this system, you can run:
#    
 
sudo apt install ifupdown
auto lo
iface lo inet loopback

auto ens33
iface ens33 inet static
        address 192.168.218.89
        netmask 255.255.255.0
        gateway 192.168.218.2
        dns-nameservers 1.1.1.1 114.114.114.114
3,重啟網路介面

ifdown --force ens33 lo && ifup -a
systemctl enable networking
systemctl restart networking
 
4，停止、取消和禁止 Netplan 相關服務執行，並移除 Netplan 軟體包及其配置檔案

1,systemd-networkd是 Netplan 後端服務（桌面版則是NetworkManager）；
2,networkd-dispatcher是 Netplan 守護服務，可通過監聽連線狀態以執行特定事件操作；
3,systemd-networkd-wait-online用於檢測systemd-networkd所管理網路介面的連線狀態；
4,systemd-resolved新的 DNS 管理服務，其配置檔案裡有的引數依賴 Netplan 後端服務工作；

systemctl stop systemd
 
-networkd networkd-dispatcher systemd-networkd-wait-online systemd-resolved
systemctl disable systemd-networkd networkd-dispatcher systemd-networkd-wait-online systemd-resolved
systemctl mask systemd-networkd networkd-dispatcher systemd-networkd-wait-online systemd-resolved
apt purge nplan netplan.io

若切換回 Netplan：
將帶有 mask 的命令換成 unmask 執行一次，不然即使 start  disable 了也沒法使用服務。

apt install nplan netplan.io
systemctl unmask systemd-networkd networkd-dispatcher systemd-networkd-wait-online systemd-resolved
systemctl enable systemd-networkd networkd-dispatcher systemd-networkd-wait-online systemd-resolved
systemctl start systemd-networkd networkd-dispatcher systemd-networkd-wait-online systemd-resolved

拓展命令：
systemctl list-dependencies systemd-networkd --reverse查詢指定服務所關聯的依賴項；
systemctl list-unit-files --type=masked --all列出/lib/systemd/system下被禁止的服務；
5，若出現dns解析不了

如果 DNS 解析不了，請檢查/etc/resolv.conf所連結的檔案是否是/run/resolvconf/resolv.conf。如果不是，執行下面命令設定。

ln -sf /run/resolvconf/resolv.conf /etc/resolv.conf