得到：
W:Failed to fetch http://ppa.launchpad.net/chris-lea/node.js/ubuntu/dists/xenial/main/binary-i386/Packages404 Not Found ,
E:Some index files failed to download. They have
been ignored, or old ones used instead.
答案1
这解决了我的问题：
sudo add-apt-repository -y -r ppa:chris-lea/node.js
sudo rm -f /etc/apt/sources.list.d/chris-lea-node_js-*.list