更新镜像源

修改 /etc/apt/sources.list

• 备份：
  sudo nano /etc/apt/sources.list sudo nano /etc/apt/sources.list.bak
• 修改：
  sudo nano /etc/apt/sources.list

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

修改/etc/apt/source.list.d/raspi.list

• 备份：
  sudo cp /etc/apt/source.list.d/raspi.list /etc/apt/source.list.d/raspi.list.bak
• 修改：
  sudo nano /etc/apt/source.list.d/raspi.list

deb http://mirrors.aliyun.com/raspberrypi/ bullseye main

更新系统

sudo apt-get update
sudo apt-get upgrade

链接: 无法更新apt镜像源？树莓派安装最新版Debian11（bullseye）arm64位系统步骤.