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Everytime I try to check for new updates, I always get this error message :

W:Failed to fetch  404  Not Found
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.

And I get a message telling me to check my internet connection, I am connected via WiFi to internet. What's the problem?

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up vote 1 down vote accepted

The PPA ppa:pmcenery/ppa "PPA for Paul McEnery" doesn't contain any packages for Precise so you can't use it.

Remove it from your software sources. See How to remove a repository? if you don't know how to do this.

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