无法安装不受信任的来源且无法下载更新信息

我将服务器从最快的服务器更改为主服务器，同时尝试使用软件管理器解决问题（不信任的源无法安装FYI）并且出现错误。

这是我得到的错误：

W:GPG error: https://download.01.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A902DDA375E52366 , W:Failed to fetch http://ppa.launchpad.net/baszczewski/qtiko/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/baszczewski/qtiko/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/hakermania/format-junkie/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/hakermania/format-junkie/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/kroq-gar78/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/kroq-gar78/ppa/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/megous/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/megous/ppa/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/moka/faba-icon-theme/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/moka/faba-icon-theme/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/moka/moka-gtk-theme/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/moka/moka-gtk-theme/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/moka/moka-icon-theme/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/moka/moka-icon-theme/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/snwh/moka-gtk-theme-daily/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/snwh/moka-gtk-theme-daily/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/snwh/moka-icon-theme-daily/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/snwh/moka-icon-theme-daily/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead. 

我尝试了如何在使用PPA或更新我的包列表时修复404错误中的步骤？ ，我仍然在软件更新程序中收到不受信任的来源错误。

Answer 1

• 首先安装Y-PPA经理：为此你必须下载deb包，你不能通过PPA安装，因为你无法更新软件列表。
  点击此链接下载deb

• 然后打开它并单击Advanced Option。

• 然后单击下图中显示的第二个选项（尝试导入所有丢失的GPG键）：

• 等一段时间。 然后单击第三个选项（尝试修复所有GPG BADSIG错误）
  您需要等待一段时间，直到它显示您通知它已完成！

• 如果您最近升级了Ubuntu，则必须单击“在Ubuntu升级后重新启用工作PPA”

• 然后运行sudo apt-get update在此之后你可以回到你想要做的事情。