E: Unable to locate package clang-7

然后再github上一问，过了几分钟就有大佬回复了，而且亲测有效 ~$ sudo apt-get -y install clang-7 clang++-7 Reading package lists.. Done E: Unable to locate package clang-7 E: Unable to locate package clang++-7 E: Couldn't find any package by regex 'clang++-7' 要解决这个问题，首先你得修改/etc/apt/source.list文件（也有可能是source.conf文件），在最后加上下面这行命令 deb http:/ main 然后更新库 sudo apt-get update sudo apt-get upgrade 最后重新运行安装命令即可 ~$ sudo apt-get -y install clang-7 clang