Ubuntu出现An error occurred during the signature verification.
Ubuntu sudo apt-get update 出现：
An error occurred during the signature verification. The repository is not updated and the previous index files will be used.
解决办法：
sudo apt-get clean
cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get clean
sudo apt-get update出现新的签名错误可以参照：
