apt-get update时,“http //ppa.launchpad.net precise release the following signatures were invalid”

I found that just doing 

`sudo rm -rf /var/lib/apt/lists && sudo mkdir /var/lib/apt/lists` 

worked for me.

此回答的原文链接:

https://answers.launchpad.net/ubuntu/+source/update-manager/+question/194077

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