记录一下解决在Ubuntu20.04LTS版中安装交叉编译工具链中遇到的arm-none-linux-gnueabi-gcc: not found问题

1. 安装交叉编译工具链

2. 将交叉编译工具链添加到全局环境变量使其全局可用

3. 更新国内阿里镜像源，如果不更新，在安装32位库时会出现各种版本不匹配的问题

   参考(233条消息) Ubuntu 20.04 && Ubuntu 18.04 修改 apt 源_星汉空兮的博客-CSDN博客

   修改source.list文件

   $ sudo vim /etc/apt/sources.list

   替换以下内容到source.list中

   # ubuntu 20.04阿里源
   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-backports main restricted universe multiverse
   deb-src http://mirrors.aliyun.com/ubuntu/ focal-backports 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
   

   更新软件

   $ sudo apt-get update
   $ sudo apt-get upgrade
   

4. 安装32位库

   $ sudo apt-get install lib32z1 lib32ncurses5-dev

5. 使用$ arm-none-linux-gnueabi-gcc -v查看是否安装成功