树莓派虚拟机换源解决办法#
树莓派 64 位系统因为还是测试版本的系统，所以国内各大网站的树莓派镜像源还不能用，就会出现由于没有公钥，无法验证下列签名的问题，我们可以使用 debian 的镜像。
1. 修改 /etc/apt/sources.list#
sudo nano /etc/apt/sources.list
将原来的内容全部注释掉（前面加个 # ）
添加
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
2. 修改 /etc/apt/sources.list.d/raspi.list#
sudo nano /etc/apt/sources.list.d/raspi.list
将原来的内容全部注释掉（前面加个 # ）
添加
deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
然后再
sudo apt-get update
完成！