解決UBUNTU16.04命令sudo apt-get update 報錯Failed to fetch(親測有效)

執行sudo apt-get update報錯:ubuntu E: Failed to fetch http://ppa.launchpad.net/v-launchpad-jochen-sprickerhof-de/pcl/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found [IP: 91.189.95.83 80] E:
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