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Please let me know how to remove certain repositories in Ubuntu 11.04. I am getting the following errors while updating.

sudo apt-get update

Err natty/main Sources                                   
  404  Not Found
Err natty/main i386 Packages                             
  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.
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marked as duplicate by Eric Carvalho, Maythux, David Foerster, kos, muru Apr 23 '15 at 23:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 37 down vote accepted

You can easily remove software repositories from the "Ubuntu Software Center"

Open "Ubuntu Software Center"
- Edit Menu
--- Select "Software Sources...", enter your password
----- Select tab "Other Software"

From the "Other Software" tab you can add or remove repositories.

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Yep, this is the proper way to remove repositories. – user4124 May 17 '11 at 12:25

Or from the terminal -

sudo add-apt-repository -r ppa:<ppa to remove>

Or, edit the /etc/apt/sources.list to find your ppa there, and remove from there manually (or automatically).

Or, remove the ppa file from /etc/apt/sources.list.d in newer versions of Ubuntu.

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You can use PPa Purge:

PPA Purge can remove a PPA and downgrade all the packages you've installed from that PPA to the official version in the Ubuntu repositories

sudo apt-get install ppa-purge

sudo ppa-purge -d <Ubuntu version> ppa:<the PPA to purge>


Or you can go to Software Sources on the Ubuntu Software Center Edit menu, enter your password, go to the Other tab, look for the PPA you wan to remove, click remove and close, it will ask you to update the repos and done.

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Is there a way to purge a repository that is not a PPA? – NobbZ Feb 6 '15 at 14:32
@NobbZ you can just use Software Sources or edit the sources.list file. – Uri Herrera Feb 8 '15 at 1:17
No, I want to PURGE it. This source has installed some mesa stuff, that is too new and so I can't install other stuff from canonicals repositories any more because of strict version constraints. That repository in question was preconfigured by the laptops manufacturer and I realized this problem far too late. Simply removing or deactivating this repository does not work, since apt keeps all the stuff that was already installed from that repo. – NobbZ Feb 8 '15 at 12:19

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