openwrt: Signature check failed. Remove wrong Signature file.

因为opkg默认采用http下载包，openwrt安装软件包时，如果下载软件列表后出现签名错误，可能是因为里面有某些敏感词。
////////////////////////// 其实是广告过滤软件的锅  关闭广告过滤就行了
解决的方法是，使用https下载。这是一个鸡和蛋的问题。根据路由器型号手工下载下面的包，然后 opkg install <包的名字>。
ca-certificates_20180409-2_all.ipk
libopenssl_1.0.2r-1_mipsel_24kc.ipk
libpcre_8.41-2_mipsel_24kc.ipk
libustream-openssl_2018-07-30-23a3f283-1_mipsel_24kc.ipk
wget_1.19.5-1_mipsel_24kc.ipk

然后在luci--system-software Distribution feeds 里面 把http 都改成https。

src/gz openwrt_core https://downloads.openwrt.org/releases/18.06.2/targets/ramips/mt7621/packages
src/gz openwrt_base https://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/base
src/gz openwrt_luci https://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/luci
src/gz openwrt_packages https://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/packages
src/gz openwrt_routing https://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/routing
src/gz openwrt_telephony https://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/telephony

Downloading https://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/telephony/Packages.gz
Updated list of available packages in /opkg-lists/openwrt_telephony
Downloading https://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/telephony/Packages.sig
Signature check passed.

一路通过。

root@OpenWrt:~# opkg update

Downloading http://downloads.openwrt.org/releases/18.06.2/targets/ramips/mt7621/packages/Packages.gz

Updated list of available packages in /var/opkg-lists/openwrt_core

Downloading http://downloads.openwrt.org/releases/18.06.2/targets/ramips/mt7621/packages/Packages.sig

Signature check passed.

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/base/Packages.gz

Updated list of available packages in /var/opkg-lists/openwrt_base

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/base/Packages.sig

Signature check failed.

Remove wrong Signature file.

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/luci/Packages.gz

Updated list of available packages in /var/opkg-lists/openwrt_luci

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/luci/Packages.sig

Signature check failed.

Remove wrong Signature file.

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/packages/Packages.gz

Updated list of available packages in /var/opkg-lists/openwrt_packages

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/packages/Packages.sig

Signature check failed.

Remove wrong Signature file.

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/routing/Packages.gz

Updated list of available packages in /var/opkg-lists/openwrt_routing

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/routing/Packages.sig

Signature check failed.

Remove wrong Signature file.

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/telephony/Packages.gz

Updated list of available packages in /var/opkg-lists/openwrt_telephony

Downloading http://downloads.openwrt.org/releases/18.06.2/packages/mipsel_24kc/telephony/Packages.sig

Signature check failed.

Remove wrong Signature file.