查看当前版本

lsb_release -a

No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 9.13 (stretch)
Release:        9.13
Codename:       stretch

更新到当前版本的最新版

apt-get update
apt-get upgrade
apt-get dist-upgrade

备份原来的源

cp /etc/apt/sources.list /etc/apt/sources.list.bak

将debian9源代号stretch，改为debian10代号buster

sed -i 's/stretch/buster/g' /etc/apt/sources.list

升级到debian10

apt-get update
apt-get upgrade
apt-get dist-upgrade

重启

reboot

查看版本

lsb_release -a

No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster

清理老版本软件

apt-get autoremove

更新到testing

testing版本为测试版本, 他的 apt 仓库是更新的, 一般也很稳定了

需要注意,为了减少问题出现,务必先更新到当前最新稳定版再更新testing

sed -i 's/buster/testing/g' /etc/apt/sources.list

apt-get update 
apt-get upgrade 
apt-get dist-upgrade

结合此文将系统和内核更新至最新
# Debian升级内核

参考：https://www.cnblogs.com/chnmig/p/12661605.html