写在前面

我个人最常用的 Linux 发行版是 debian，因为我觉得它比 Ubuntu 更轻量更稳定更高效。因为每次装完系统都需要更换镜像源，还有其他乱七八糟的事情，所以把过程中的一些问题总结在这里。

apt 更换国内源

• 镜像源文件为： /etc/apt/sources.list
• 国内常用镜像源：

  deb http://mirrors.163.com/debian/ buster main non-free contrib
  deb http://mirrors.163.com/debian/ buster-updates main non-free contrib
  deb http://mirrors.163.com/debian/ buster-backports main non-free contrib
  deb http://mirrors.163.com/debian-security/ buster/updates main non-free contrib
  deb-src http://mirrors.163.com/debian/ buster main non-free contrib
  deb-src http://mirrors.163.com/debian/ buster-updates main non-free contrib
  deb-src http://mirrors.163.com/debian/ buster-backports main non-free contrib
  deb-src http://mirrors.163.com/debian-security/ buster/updates main non-free contrib
  

• 更新源：sudo apt-get update
• public GPG key error (“NO_PUBKEY)解决方法

  sudo apt-key adv --keyserver hkp://pool.sks-keyservers.net:80 --recv-keys THE_MISSING_KEY_HERE    #THE_MISSING_KEY_HERE 用缺少的公钥替换