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My update manager always failed the last few days. This what I get

W: Failed to fetch http://ppa.launchpad.net/rohityadav/vlmc/ubuntu/dists/quantal/main/source/Sources  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

marked as duplicate by Uri Herrera, Tom Brossman, qbi, Seth, user25656 Mar 8 '13 at 0:26

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  • Hi & welcome! Did you try to remove that ppa? – Zlatan Mar 7 '13 at 19:06
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Click on the Super (Windows) key and open software sources.

After that click on the other software tab

Find the repository that you posted (http://ppa.launchpad.net/rohityadav/vlmc/ubuntu/dists/quantal/main/source/Sources) and remove that. You need to enter your root password to do that.

Again start the update manager and you will be fine.

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    @SamvelMartirosyan, if the answer was the right one for your problem, please accept it by clicking on the check mark. – guntbert Mar 7 '13 at 20:57

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