https://www.arduino.cn/package_esp8266com_index.json
http://arduino.esp8266.com/stable/package_esp8266com_index.json
https://dl.espressif.cn/dl/package_esp32_index.json
https://raw.githubusercontent.com/digistump/arduino-boards-index/master/package_digistump_index.json

-- 中文站

http://192.168.31.22:9000/mirror/esp8266/package_esp8266-3.1.2_index.json

ATtiny：http://drazzy.com/package_drazzy.com_index.json

https://github.com/espressif/arduino-esp32/releases/download/3.3.4/package_esp32_index_cn.json

-- 以下是新版
https://espressif.github.io/arduino-esp32/package_esp32_index.json
https://arduino.esp8266.com/stable/package_esp8266com_index.json
https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json

http://drazzy.com/package_drazzy.com_index.json

地址替换
https://kkgithub.com
国内镜像源发布地址：https://www.sockstack.cn/github

CH340驱动

# 备份原配置（可选）
cp /etc/apt/sources.list /etc/apt/sources.list.bak

# 替换成阿里云镜像（速度快，基本不403）
cat > /etc/apt/sources.list << 'EOF'
deb http://mirrors.aliyun.com/ubuntu/ noble main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ noble-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ noble-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ noble-security main restricted universe multiverse
EOF