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How can I fix a 404 Error using a PPA?

When I try the software updater, it tells me that it Failed to download Repository Information and I should check my internet connection. Of course my internet works. The error it reproduces is below

W:GPG error: debs Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E18CE6625CB26B26,
W:Failed to fetch  404  Not Found,
W:Failed to fetch  404  Not Found,
E:Some index files failed to download. They have been ignored, or old ones used instead.`

How do I fix this?

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marked as duplicate by devav2, belacqua, con-f-use, Takkat, Ringtail Nov 4 '12 at 3:02

This question was marked as an exact duplicate of an existing question.

up vote 0 down vote accepted

This generally means that there is no PPA for the current version of Ubuntu you are running (quantal). if you go to you will see PPAs for previous releases.

lucid/  19-Jan-2012 09:12   -

[DIR] maverick/ 19-Jan-2012 09:12 - [DIR] natty/ 19-Jan-2012 09:12 - [DIR] oneiric/ 18-Jan-2012 14:22 - [DIR] precise/ 19-Jan-2012 09:12

So you need to wait until a quantal PPA is added.

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Thanks. Going to the software update settings and turning off the java ppa updates solved the issue. – jason328 Nov 3 '12 at 20:08

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