There is no public key available for the following key IDs

Question

最近在执行apt-get update的时候总是会提示

There is no public key available for the following key IDs

怀疑这与我前一段时间更换源有关，最初是阿里云的源，后来为了把php升级到最新版就是用了ppa的源，在后来这个ppa的源老是有网络问题，我就直接把ppa的源删掉然后换回阿里云的源，现在执行apt-get update的时候就总是会提示"There is no public key available for the following key IDs"

请教一下各位有么有方法修复这个问题?

Answer 1

这个？
http://baiqiuyi.com/linux/debian-there-is-no-public-key-available-for-the-following-key-ids.html

Answer 2

sudo apt-get install debian-keyring debian-archive-keyring
sudo apt-key update
sudo apt-get update