首先查看版本
lsb_release -c
Codename: eoan
即为eoan版本
下面是163的源
deb http://mirrors.163.com/ubuntu/ eoan main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ eoan-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ eoan-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ eoan-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ eoan-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ eoan main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ eoan-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ eoan-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ eoan-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ eoan-backports main restricted universe multiverse
当然如果第一步获取的版本不是eoan 就把上面的eoan替换成你自己的版本
然后把/etc/apt/sources.list删除 把上面的内容写进去
保存后执行
sudo apt-get update