g++ : 依赖: g++-5 (＞= 5.3.1-3~) 但是它将不会被安装E: 无法修正错误

g++ : 依赖: g++-5 (＞= 5.3.1-3~) 但是它将不会被安装E: 无法修正错误

换源命令：sudo gedit sources.list
阿里源：

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse

deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse

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

sudo apt-get install update

安装g++时出现依赖报错，可以通过换更新的源解决。
笔者之前为了解决g++依赖的问题，卸载了apt安装了aptitude结果引来了一堆麻烦，重装系统好几次也没有解决。想不到换源就能解决，是我格局小了orz。欢迎讨论ovo