修改源文件 vim /etc/apt/sources.list
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb 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 main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
重启
service networking restart
Debian 9, Debian 10 以及Ubuntu 关闭IPv6
编辑/etc/sysctl.conf 文件，在文件的最末尾添加下面的entry:
net.ipv6.conf.all.disable_ipv6 = 1
如果仅想关闭某一网卡的ipv6，比如说ens4, 那就可以添加下面的entry:
net.ipv6.conf.ens4.disable_ipv6 = 1
让命令生效:
sysctl -p
Ubuntu配置apt在线源后执行apt update报Certificate verification failed错解决方法
【解决方法】
vim /etc/apt/sources.list增加[trusted=yes]
deb [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic main restricted universe multiverse
deb-src [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic main restricted universe multiverse
deb [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic-security main restricted universe multiverse
deb-src [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic-security main restricted universe multiverse
deb [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb-src [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb-src [trusted=yes] https://repo.huaweicloud.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
## Not recommended
# deb https://repo.huaweicloud.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse
# deb-src https://repo.huaweicloud.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse
Debian修改IP及DNS
编辑文件
vim /etc/network/interfaces
设置静态IP
auto lo
iface lo inet lookback
auto eth0
iface eth0 inet static #将网卡eth0设置为获取静态地址
address 192.168.1.10 #替换为自己的IP地址
netmask 255.255.255.0 #替换为自己的子网掩码
gateway 192.168.1.1 #替换为自己的网关地址
设置为DHCP自动获取IP
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp #将网卡eth0设置为自动获取IP
重启网卡服务
service networking restart
修改DNS,编辑文件
vim /etc/resolv.conf
添加DNS
nameserver 114.114.114.114 #替换为自己的DNS服务器地址
查询IP
ifconfig
测试网络连通
ping www.baidu.com