#由于树莓派在国内速度太慢，可以更换为国内软件源。
1、更新/etc/apt/sources.list
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
sudo nano /etc/apt/sources.list
替换以下软件源
ARM(32位系统)
deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ bullseye main contrib non-free rpi
#deb-src http://mirrors.ustc.edu.cn/raspbian/raspbian/ bullseye main contrib non-free rpi
ARM64(64位系统)
Arm64 架构的 Raspberry Pi OS 仍处于 beta 状态，中科大源亦不含此架构。对于 arm64 的 Raspberry Pi OS，可以直接使用 arm64 Debian 的源（以 Bullseye 示例）：
deb https://mirrors.ustc.edu.cn/debian/ bullseye main contrib non-free
#deb-src http://mirrors.ustc.edu.cn/debian bullseye main contrib non-free
deb https://mirrors.ustc.edu.cn/debian/ bullseye-updates main contrib non-free
#deb-src http://mirrors.ustc.edu.cn/debian bullseye-updates main contrib non-free
deb https://mirrors.ustc.edu.cn/debian-security bullseye-security main contrib non-free
#deb-src http://mirrors.ustc.edu.cn/debian-security/ bullseye-security main non-free contrib
2、更新/etc/apt/sources.list.d/raspi.list
sudo cp /etc/apt/sources.list.d/raspi.list.bak
sudo nano /etc/apt/sources.list.d/raspi.list
替换以下软件源
ARM(32位系统)
deb https://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ bullseye main
#deb-src https://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ bullseye main
ARM64(64位系统)
deb https://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ bullseye main
#deb-src https://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ bullseye main
3、更新
sudo apt update && sudo apt dist-upgrade
4、The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY xxxxxxxxxxxxxxxxxxx
sudo apt-key adv –recv-keys –keyserver keyserver.ubuntu.com xxxxxxxxxxxxxxxxxxx
4、EEPROM更新
sudo apt update
sudo apt upgrade
sudo apt install rpi-eeprom
sudo rpi-eeprom-update
4.1、官方自动更新
sudo rpi-eeprom-update -a
4.2、自定义更新
wget https://github.com/raspberrypi/rpi-eeprom/archive/master.zip
解压进相应的路径
unzip master.zip
cd rpi-eeprom-master/firmware/beta/
sudo rpi-eeprom-update -d -f 要更新的固件名称
更新完成后重启树莓派
sudo reboot
官方链接https://www.raspberrypi.org/documentation/hardware/raspberrypi/booteeprom.md
5、树莓派正确swap分区
sudo vi /etc/dphys-swapfile
sudo nano /etc/dphys-swapfile
将 CONF_SWAPSIZE 的值修改成你想要的大小。
sudo /etc/init.d/dphys-swapfile restart
查看大小
free -h
Enjoy It！😍