diff --git a/sources/tech/20140915 Linux FAQs with Answers--How to find and remove obsolete PPA repositories on Ubuntu.md b/sources/tech/20140915 Linux FAQs with Answers--How to find and remove obsolete PPA repositories on Ubuntu.md
index 1fe04a25f6..7c27ef192a 100644
--- a/sources/tech/20140915 Linux FAQs with Answers--How to find and remove obsolete PPA repositories on Ubuntu.md	
+++ b/sources/tech/20140915 Linux FAQs with Answers--How to find and remove obsolete PPA repositories on Ubuntu.md	
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+Translating by GOLinux ...
 Linux FAQs with Answers--How to find and remove obsolete PPA repositories on Ubuntu
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 > **Question**: I was trying to re-synchronize package index files by running apt-get update. But I am getting the following "404 Not Found" errors. Looks like I cannot fetch the latest index from some third-party PPA repositories that I've added before. How can I clean up such broken and old PPA repositories?
@@ -41,4 +42,4 @@ via: http://ask.xmodulo.com/find-remove-obsolete-ppa-repositories-ubuntu.html
 
 本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
 
-[1]:http://ask.xmodulo.com/how-to-remove-ppa-repository-from-command-line-on-ubuntu.html
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+[1]:http://ask.xmodulo.com/how-to-remove-ppa-repository-from-command-line-on-ubuntu.html