新系统Ubuntu18.04安装Qt5.12遇到的问题总结

个人在新安装系统下安装Qt5遇到的问题总结：

我们先修改apt源，默认的是外国的地址，访问太慢了

1.备份sources.list命令

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bcakup

2.编辑sources.list命令

sudo gedit /etc/apt/sources.list

注释或者删除以前的内容，添加清华和阿里的源

# 清华大学源
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
##測試版源
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
# 源碼
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.tuna.tsinghua.edu.cn/u