ubuntu18.0.4分Server和Desktop版本，它们之间用图形配置的网卡地址存储的配置文件是不一样的，所以在配置时，需要注意一下。

一、ubuntu18.0.4文本配置修改方法

#netplan配置方法

1、ubuntu18.04 使用了netplan来管理网络：查看/etc/netplan下面的文件，如果没有*.yaml后缀的文件，就运行如下命令创建一个（netplan会读取该目录下所有该后缀的文件）：

sudo netplan generate

2、打开网络地址配置文件

vim /etc/netplan/01-netcfg.yaml

network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      dhcp4: no  //手动配置
      addresses: [192.168.10.121/24] //ip地址
      gateway4: 192.168.10.254  //网关
      nameservers:
             addresses: [192.168.10.131]  //dns服务器地址

3、通过netplan更新配置

sudo netplan apply

4、用ifconfig或者ip r l查看配置的信息

#ifconfig

ifconfig

eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.10.121  netmask 255.255.255.0  broadcast 192.168.10.255
        inet6 fe80::3648:edff:fef9:557c  prefixlen 64  scopeid 0x20<link>
        ether 34:48:ed:f9:55:7c  txqueuelen 1000  (Ethernet)
        RX packets 2512951  bytes 266808016 (266.8 MB)
        RX errors 0  dropped 33502  overruns 0  frame 0
        TX packets 1106168  bytes 77337745 (77.3 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 80

#ip r l

ip r l
default via 192.168.10.254 dev eno1 proto static
192.168.10.0/24 dev eno1 proto kernel scope link src 192.168.10.121

二、ubuntu18.0.4图形配置修改方法

#通过dpkg -l ubuntu-desktop查看，安装的是ubuntu-desktop版本

dpkg -l ubuntu-desktop

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                           Version              Architecture         Description
+++-==============================-====================-====================-=================================================================
ii  ubuntu-desktop                 1.417                amd64                The Ubuntu desktop system

是用图形界面配置的网络 默认使用了NetworkManager来配置网卡地址，配完后信息存在

/etc/NetworkManager/system-connections/Wired\ connection\ 1

[connection]
id=Wired connection 1
uuid=f902ce0e-d3f2-3ffa-b382-55080ce8fde8
type=ethernet
autoconnect-priority=-999
permissions=
timestamp=1657781148

[ethernet]
mac-address=0C:C4:7A:E1:88:3E
mac-address-blacklist=

[ipv4]
address1=192.168.10.104/24,192.168.10.254
dns=192.168.10.131;
dns-search=
method=manual

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=auto

#如果用远程ssh上去，还可以用 nmtui命令进行修改