1.导入公钥
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 3B4FE6ACC0B21F32
备份sources.list
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
查看备份:
ls /etc/apt/sources.*
2.修改/etc/apt/sources.list内容,全部替换为下面内容
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb