相关疑难解决方法(0)

PPA 似乎一直处于离线状态。每当我使用时sudo apt-get update，都会显示此错误：

W: Failed to fetch http://ppa.launchpad.net/ 404  Not Found

如何修复这些错误？

我通过添加存储库开始设置，然后sudo apt-get update在开始安装其他软件之前再次运行，然后我得到了签名密钥行，然后它就停止了。所以它基本上不会让我现在更新任何包。

d@EliteBook:~/Downloads$ sudo apt-get update
Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:2 http://dl.google.com/linux/chrome/deb stable Release                     
Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease              
Get:5 http://ca.archive.ubuntu.com/ubuntu xenial InRelease [247 kB]
Hit:6 http://ca.archive.ubuntu.com/ubuntu xenial-updates InRelease
Hit:7 http://ca.archive.ubuntu.com/ubuntu xenial-backports InRelease
Fetched 247 kB in 0s (256 kB/s)                   
Reading package lists... Done
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by 
key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
d@EliteBook:~/Downloads$

每当我在 Ubuntu 中设置并开始安装东西时，我以前从未见过这种情况。还有什么我可以做的吗？

Here's what I keep getting when I sudo apt update

Hit:1 http://archive.canonical.com/ubuntu xenial InRelease
Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease                   
Get:3 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]     
Hit:4 http://dl.google.com/linux/chrome/deb stable Release                     
Hit:5 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu xenial InRelease
Hit:6 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu xenial InRelease      
Hit:7 http://eg.archive.ubuntu.com/ubuntu xenial InRelease                     
Hit:8 http://ppa.launchpad.net/linrunner/tlp/ubuntu xenial InRelease     
Get:9 http://eg.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]
Hit:10 http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu xenial InRelease   
Hit:12 http://ppa.launchpad.net/openjdk-r/ppa/ubuntu xenial InRelease          
Hit:13 http://ppa.launchpad.net/plushuang-tw/uget-stable/ubuntu xenial InRelease
Hit:14 http://ppa.launchpad.net/ubuntu-desktop/gnome-software/ubuntu xenial InRelease
Get:15 http://eg.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Hit:16 http://ppa.launchpad.net/ubuntu-desktop/ubuntu-make/ubuntu xenial InRelease
Hit:17 http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu xenial InRelease …