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I already checked for a possible answer to my question, but, how to fix this since my details are different from the other people here. Here's my error information on Software Updater:

[W:Failed to fetch  404  Not Found [IP: 80]
, W:Failed to fetch  404  Not Found [IP: 80]
, E:Some index files failed to download. They have been ignored, or old ones used instead.]

Any advise would be great. Thanks!

share|improve this question
The failed repository seems to be someone's dropbox. The owner may have removed the files or there may be a routing problem. Do you know anything about a third party repository on the system? Can you tell us more about it. – mikewhatever Feb 15 '13 at 3:30
Possible Duplicate: How can I fix a 404 Error using a PPA? – Aditya Mar 28 '13 at 15:11
@mikewhatever It looks like the official repository for the Dropbox software (the APT line for which looks like deb quantal main), not like someone's personal dropbox files! – Eliah Kagan Mar 28 '13 at 15:35
@EliahKagan: It's Dropbox's Official Private PPA, just like Google provides for Chrome. Moreover, it looks like removing the PPA and adding it again (if necessary) would solve the issue since 404 Error is not generated when we follow the link in browser. This is certainly covered in the answers given in that question. – Aditya Mar 28 '13 at 16:02
@Aditya No, there's a difference between an unofficial repository and a PPA. These are not PPA's. Private PPA's are still hosted on Launchpad and have launchpad in the URL. If the answers to that PPA-specific question aren't really PPA-specific, then the question should be generalized. That needs to happen before we start closing non-PPA questions as duplicates of it. Furthermore, I seem to recall that discussions geared toward generalizing it have resulted in no action because it doesn't really apply fully to non-PPA software sources. But I could be remembering wrongly. – Eliah Kagan Mar 28 '13 at 16:05
  1. Are you sure that your computer has access to the Internet?
  2. You can always download from other repositories.
  3. Try pinging them first prior to downloading from them.
  4. Maybe try wget or apt-get?
share|improve this answer
Yep, i'm connected. But, how do I repair the error? – Yanka Feb 15 '13 at 1:30
This page should help you: (…;. – Eugene Feb 15 '13 at 1:52
There's a lot of topics on that page. Where should I go? – Yanka Feb 15 '13 at 2:10
Sorry, it should be this site. – Eugene Feb 15 '13 at 3:05
And another point: you should be checking for other repositories instead of the default ones. And why are you downloading the files for two different architectures (and64 and i386)? Also, Try changing your download server: System > Administration > Software Sources. Change the "Download from:" dropdown box to some other server. – Eugene Feb 15 '13 at 3:10

Dropbox's package repository doesn't provide packages specifically for Ubuntu 12.10 (quantal), but the packages for Ubuntu 12.04 LTS (precise) should work fine. Open up Software Center > Edit > Software Sources, find the Dropbox entry on the Other Software tab, click Edit, and replace quantal with precise.

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