When I run apt-get update, this happens:Hit http://dl.google.com stable Release.gpgHit 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-enErr http://ppa.launchpad.net wheezy/main Sources  404  Not FoundErr http://ppa.launchpad.net wheezy/main i386 Packages  404  Not FoundIgn http://ppa.launchpad.net wheezy/main Translation-en_USIgn http://ppa.launchpad.net wheezy/main Translation-enW: Failed to fetch http://ppa.launchpad.net/glasen/intel-driver/ubuntu/dists/wheezy/main/source/Sources  404  Not FoundW: Failed to fetch http://ppa.launchpad.net/glasen/intel-driver/ubuntu/dists/wheezy/main/binary-i386/Packages  404  Not FoundE: Some index files failed to download. They have been ignored, or old ones used instead.This has been caused by running apt-add-repository ppa:glasen/intel-driver. How can I undo what has happened from the previous command so that apt-get update works properly?Note: This is on a Dell Dimension 3000
apt-get update won't update - undo /apt-add-repository
debian;apt;crunchbang
You just need to edit your sources. apt-add-repository simply adds a new deb line to the system's list of source repositories. These are stored as simple text files in /etc/apt/sources.list and /etc/apt/sources.list.d.So, first find out where the offending repo is stored:grep -F ppa.launchpad.net /etc/apt/sources.list /etc/apt/sources.list.dThis will return a list of files that contain the relevant line. For example:/etc/apt/sources.list: deb http://ppa.launchpad.net/glasen/intel-driver/ ubuntu mainYou can then open the listed file in your favorite editor (as root, sudo) and delete or comment out (add a # to the beginning of the line) the relevant lines. 