The repository 'http://ppa.launchpad.net/v-launchpad-jochen-sprickerhof-de/pcl/ubuntu xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
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: 2001:67c:1560:8008::15 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
解决方法
在/etc/apt/sources.list.d中将关于/v-launchpad-jochen-sprickerhof-de/pcl的文件删掉
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