可以参考debian wiki
1.识别自己显卡驱动
lspci -nn | grep VGA
2.添加源
# Debian 9 "stretch" deb http://httpredir.debian.org/debian/ stretch main contrib non-free
3.更新缓存
apt-get update
4.开始安装
apt-get install firmware-linux-nonfree libgl1-mesa-dri xserver-xorg-video-ati
5.重启即可
原文:https://www.cnblogs.com/SirPi/p/9738013.html