可能重复：
如何使用 PPA 修复 404 错误？
细节
W:Failed to fetch *http://ppa.launchpad.net/jonls/redshift-ppa/ubuntu/dists/precise/main/source/Sources 404 Not Found
, W:Failed to fetch *http://ppa.launchpad.net/jonls/redshift-ppa/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found
, W:Failed to fetch *http://ppa.launchpad.net/jonls/redshift-ppa/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found
, E:Some index files failed to download. They have been ignored, or old ones used instead.
这是什么原因造成的以及如何解决？
泰
问候
答案1
jonls/redshift-ppa看起来已被删除。运行：
sudo add-apt-repository -r ppa:jonls/redshift-ppa将其删除。