ubuntu系统源换为 ali 源

function cha_mirr(){
    local target="/etc/apt/sources.list"
    sudo cp $target $target.bak
    sudo sed -i 's/http:\/\/.*archive.ubuntu/http:\/\/mirrors.aliyun/g' $target
    sudo sed -i "s/security.ubuntu/mirrors.aliyun/g" $target
    log_suss "换源成功"
    sudo apt update
}