我在安装 Ubuntu 16.10 后遇到了问题，升级并重新安装了它，发现我的笔记本电脑上有很多错误，谁知道是什么。我只是在猜测我试图解决问题，所以可能只会让事情变得更糟。我正在关注安装 Ubuntu 16.10 (Yakkety Yak) 后要做的 37 件事，以使其更加用户友好，以为事情会得到解决……无论如何，我尝试安装这个全新应用程序 - 安装后 Ubuntu（无忧软件安装）在我完成“sudo add-apt-repository ppa:thefanclub/ubuntu-after-install”并更新后，我收到此错误消息：
W: The repository 'http: //ppa.launchpad.net/thefanclub/ubuntu-after-install/ubuntu yakkety 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.
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/thefanclub-ubuntu-ubuntu-after-install-yakkety.list:2 and /etc/apt/sources.list.d/thefanclub-ubuntu-ubuntu-after-install-yakkety.list:3
E: Failed to fetch http: //ppa.launchpad.net/thefanclub/ubuntu-after-install/ubuntu/dists/yakkety/main/source/Sources 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/thefanclub-ubuntu-ubuntu-after-install-yakkety.list:2 and /etc/apt/sources.list.d/thefanclub-ubuntu-ubuntu-after-install-yakkety.list:3
好吧，我想我就此打住，看看能不能找到愿意帮助我的人。我只是太困惑了，一直在尝试新方法，我想这完全是愚蠢的！！:(
非常感谢您的帮助！！