Ubuntu安装VScode以及安装GCC

Installing GCC on Ubuntu 20.04

$sudo apt-get update
$sudo apt-get install build-essential
$sudo apt-get install manpages-dev

$gcc --version
    Ubuntu 20.04 repositories provide GCC version 9.3.0:
	gcc (Ubuntu 9.3.0-10ubuntu2) 9.3.0
    Copyright (C) 2019 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.  There is NO
    warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$nano hello.c
     // hello.c
    #include <stdio.h>

    int main() {
        printf("Hello, world!\n");
        return 0;
    }
```	   
```bash
$gcc hello.c -o hello
$./hello
    The program should print:
	Hello World!

镜像

用sudo gedit /etc/apt/sources.list 打开，把地址复制进去

镜像地址加速–阿里云

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

如何卸载GCC

sudo dpkg -l | grep gcc

安装gcc报错信息

rudy@rudy:~/Desktop$ sudo apt install build-essential
[sudo] password for rudy: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 build-essential : Depends: libc6-dev but it is not going to be installed or
                            libc-dev
                   Depends: g++ (>= 4:7.2) but it is not going to be installed
                   Depends: dpkg-dev (>= 1.17.11) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

###### Ubuntu Main Repos
deb http://us.archive.ubuntu.com/ubuntu/ wily main
deb-src http://us.archive.ubuntu.com/ubuntu/ wily main

###### Ubuntu Update Repos
deb http://us.archive.ubuntu.com/ubuntu/ wily-security main
deb http://us.archive.ubuntu.com/ubuntu/ wily-updates main
deb-src http://us.archive.ubuntu.com/ubuntu/ wily-security main
deb-src http://us.archive.ubuntu.com/ubuntu/ wily-updates main