ubuntu关于W: GPG error: http://archive.canonical.com intrepid Release错误

 方法1：
Try to run the following comamnds from terminal

$ sudo -i
apt-get clean
cd /var/lib/apt
mv lists lists.old
mkdir -p lists/partial
apt-get clean
apt-get update

方法2：
Try to run the following comamnds from terminal

sudo aptitude -o Acquire::http::No-Cache=True -o Acquire::BrokenProxy=true update
sudo apt-get update

参考：https://blog.youkuaiyun.com/feilongzaitianhehe/article/details/49964301