Debian报错：There is no public key available for the following key IDs:9D6D8F6BC857C906
解决办法(需在root下操作)：
# gpg --recv-keys 9D6D8F6BC857C906
# gpg --export 9D6D8F6BC857C906 | apt-key add -
# apt-get update （即不会再提示报错）
There is no public key available for the following key IDs:9D6D8F6BC857C906
原文：http://yangzhiming.blog.51cto.com/4849999/1729462