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Whenever I execute sudo apt-get update I get this error message:

W: Failed to fetch  404  Not Found

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

I've checked my /etc/apt/sources.list file, but there is no reference to . Could anyone help me?

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marked as duplicate by Wilf, bodhi.zazen, Jorge Castro, Eliah Kagan, Luis Alvarado Jul 25 '14 at 19:03

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.

Try grep -r jolicloud /etc/apt – bain Jul 25 '14 at 18:00
try this question: How can I fix a 404 Error when updating packages? – Wilf Jul 25 '14 at 18:03
Natty (11.04) is way beyond end of life and I would highly encourage you to upgrade to a supported version of Ubuntu. – bodhi.zazen Jul 25 '14 at 18:14
That PPA is installed for Natty. Is that the version you're running? What's the output of lsb_release -a? – Eliah Kagan Jul 25 '14 at 18:58
up vote 1 down vote accepted


grep -r jolicloud /etc/apt/sources.list.d

and then remove the files that are listed with this command.

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There will be a file /etc/apt/sources.d/ with an entry for that PPA. That said, that PPA does not support Natty, and you really shouldn't be on Natty. Natty, or Ubuntu 11.04, reached End-of-Life in October 2012. Do upgrade to Ubuntu 12.04 or Ubuntu 14.04.

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@Hannu what am I supposed to see? – muru Jul 25 '14 at 18:12
@Hannu - ubuntu releases are here - . IMHO, whenever possible, official pages are more palatable then wikipedia ;) – bodhi.zazen Jul 25 '14 at 18:13
"natty" - cryptic for a newbie, I had no idea there was a natty-release, could just as well have been a special type of napkin. – Hannu Jul 25 '14 at 18:14 -> wikipedia among first hits for me. ;-p – Hannu Jul 25 '14 at 18:16

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