E: The repository ‘
http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu
bionic Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
背景：在Ubuntu18.04.2 下，想重装sublime，手动删除了所有sublime的配置文件
目的：想要完整的重装sublime text3
问题：sudo apt-get update更新软件源的时候出现问题
解决：进入cd /etc/apt/sources.list.d将关于sublime的源删除
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