ubuntu18.04 查詢ip用ifconfig的各種錯誤解決辦法

問題原因：Ubuntu18.04很多東西還夠完善

1、ifconfig報錯

解決辦法

sudo apt install net-tools

2、sudo apt install net-tools報錯

解決辦法

sudo apt-get update

3、sudo apt-get update網絡問題，更換成清華鏡像源

解決辦法

(1) sudo gedit /etc/apt/sources.list

(2) 打開文件sources.list，最後追加清華鏡像源

deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu/ xenial-security main restricted universe multiverse

添加清華鏡像源，sources.list 如下：
添加前

添加後

4、final依次運行以下代碼

(1) sudo apt-get update

(2) sudo apt install net-tools

(3) ifconfig

Done！解決了