编辑net配置
sudo vim /etc/netplan/00-network-manager-all.yaml

let networkmanager manage all devices on this system

network:
version:2
renderer:networkmanager
ethernets:
ens33:
dhcp4:no
addresses:[192.168.166.180/24]
gateway4:192.168.166.1
nameservers:
addresses:[114.114.114.114]

重启net网络
sudo netplan --debug apply

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更换源文件
sudo chmod 777 /etc/apt/sources.list
sudo vim /etc/apt/sources.list

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse