0，环境

服务器： Intel(R) Xeon(R) Gold 6248R CPU @ 3.00GHz  96核

网卡： 多网卡

1， 镜像下载

http://old-releases.ubuntu.com/releases/ubuntu-20.04.1-desktop-amd64.iso

2， 系统安装--具体步骤就不贴出来，网上很多资料

3，配置网络

sudo vim /etc/netplan/00-installer-config.yaml

# This is the network config written by 'subiquity'
network:
  version: 2
  renderer : networkd
  ethernets:
          enp6s0f0:
                   dhcp4 : false
                   addresses : [192.168.1.45/24]
                   gateway4 : 192.168.1.254
                   nameservers:
                         addresses : [114.114.114.114,8.8.8.8]
                   optional : true

重启网络： 无效的话，重启一下服务器

sudo netplan applay

4， 问题

本机器原来安装是centos， 网卡名字叫做enp6s0f0， 但是安装了ubuntu之后网卡名字变了， 可以通过如下方式来进行处理：

ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens9f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 58:c7:ac:c8:8b:5c brd ff:ff:ff:ff:ff:ff
3: ens9f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 58:c7:ac:c8:8b:5d brd ff:ff:ff:ff:ff:ff
4: ens9f2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 58:c7:ac:c8:8b:5e brd ff:ff:ff:ff:ff:ff
5: ens9f3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether 58:c7:ac:c8:8b:5f brd ff:ff:ff:ff:ff:ff
6: ens3f0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether a4:fa:76:0a:91:8a brd ff:ff:ff:ff:ff:ff
7: ens3f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether a4:fa:76:0a:91:8b brd ff:ff:ff:ff:ff:ff
8: ens6f0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
    link/ether a4:fa:76:0a:7d:06 brd ff:ff:ff:ff:ff:ff
9: ens6f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ether a4:fa:76:0a:7d:07 brd ff:ff:ff:ff:ff:ff

其中state UP，表示连接状态，如果都是stat DOWN， 可以通过如下命令查看

sudo ethtool  ens9f0
Settings for ens9f0:
	Supported ports: [ TP ]
	Supported link modes:   1000baseT/Full 
	Supported pause frame use: Symmetric
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  1000baseT/Full 
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 1000Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: Unknown
	Supports Wake-on: g
	Wake-on: g
	Current message level: 0x00000007 (7)
			       drv probe link
	Link detected: yes

其中Link detected: yes 表示连接正常，也就是当前需要配置的网卡， 在/etc/netplan/00-installer-config.yaml中ethernets: enp6s0f0改成ens9f0