问题1：-bash: curl: command not found

解决方法：

apt-get --allow-releaseinfo-change update
apt-get dist-upgrade
apt install -y curl

问题2：运行apt install -y curl   

报错：E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

  解决方法：  更新本地 apt 源或替换源

apt update