自带的源不好用，自己找了一个，还是在中科大源站上改的，中科大这个网站上的资源太多了
ssh登录后替换/etc/opkg/distfeeds.conf 里面的源地址，也可能是 /etc/opkg.conf 自己看自己的源地址放在哪个文件里面，把它替换了就行了
vim /etc/opkg/distfeeds.conf
src/gz openwrt_core http://mirrors.ustc.edu.cn/openwrt/releases/19.07.6//targets/ramips/mt7621/packages src/gz openwrt_base http://mirrors.ustc.edu.cn/openwrt/releases/19.07.6//packages/mipsel_24kc/base src/gz openwrt_luci http://mirrors.ustc.edu.cn/openwrt/releases/19.07.6//packages/mipsel_24kc/luci src/gz openwrt_packages http://mirrors.ustc.edu.cn/openwrt/releases/19.07.6//packages/mipsel_24kc/packages src/gz openwrt_routing http://mirrors.ustc.edu.cn/openwrt/releases/19.07.6//packages/mipsel_24kc/routing src/gz openwrt_telephony http://mirrors.ustc.edu.cn/openwrt/releases/19.07.6//packages/mipsel_24kc/telephony
