当我运行时apt-get update，会发生以下情况：
Hit http://dl.google.com stable Release.gpg
Hit http://dl.google.com stable Release
Hit http://security.debian.org wheezy/updates Release.gpg
Hit http://packages.crunchbang.org waldorf Release.gpg
Hit http://security.debian.org wheezy/updates Release
Ign http://ppa.launchpad.net wheezy Release.gpg
Hit http://packages.crunchbang.org waldorf Release
Hit http://dl.google.com stable/main i386 Packages
Ign http://ppa.launchpad.net wheezy Release
Hit http://security.debian.org wheezy/updates/main i386 Packages
Hit http://security.debian.org wheezy/updates/main Translation-en
Hit http://packages.crunchbang.org waldorf/main i386 Packages
Hit http://http.debian.net wheezy Release.gpg
Ign http://dl.google.com stable/main Translation-en_US
Ign http://dl.google.com stable/main Translation-en
Hit http://http.debian.net wheezy Release
Hit http://http.debian.net wheezy/main i386 Packages
Hit http://http.debian.net wheezy/contrib i386 Packages
Ign http://packages.crunchbang.org waldorf/main Translation-en_US
Hit http://http.debian.net wheezy/non-free i386 Packages
Ign http://packages.crunchbang.org waldorf/main Translation-en
Hit http://http.debian.net wheezy/contrib Translation-en
Hit http://http.debian.net wheezy/main Translation-en
Hit http://http.debian.net wheezy/non-free Translation-en
Err http://ppa.launchpad.net wheezy/main Sources
404 Not Found
Err http://ppa.launchpad.net wheezy/main i386 Packages
404 Not Found
Ign http://ppa.launchpad.net wheezy/main Translation-en_US
Ign http://ppa.launchpad.net wheezy/main Translation-en
W: Failed to fetch http://ppa.launchpad.net/glasen/intel-driver/ubuntu/dists/wheezy/main/source/Sources 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/glasen/intel-driver/ubuntu/dists/wheezy/main/binary-i386/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
这是由于运行引起的apt-add-repository ppa:glasen/intel-driver。如何撤消上一条命令中发生的一切，使其apt-get update正常工作？
注意：这是在Dell Dimension 3000上
您只需要编辑源即可。apt-add-repository只需deb在系统的源存储库列表中添加新行即可。它们以简单的文本文件存储在/etc/apt/sources.list和中/etc/apt/sources.list.d。
因此，首先找出有问题的回购存储在哪里：
grep -F ppa.launchpad.net /etc/apt/sources.list /etc/apt/sources.list.d
这将返回包含相关行的文件列表。例如：
/etc/apt/sources.list: deb http://ppa.launchpad.net/glasen/intel-driver/ ubuntu main
然后，您可以在自己喜欢的编辑器中（以root身份sudo）打开列出的文件，并删除或注释掉#相关行（在行的开头添加a ）。
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我来说两句