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I've noticed that running apt-get update recently has resulted in quite a few ppa's returning "403 Forbidden". In and effort to clean them up I had a look:

W: Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/dists/raring/main/binary-amd64/Packages 403 Forbidden

W: Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/dists/raring/main/binary-i386/Packages 403 Forbidden

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

The strange things is, if I copy these URLs into my browser I can access the files just fine. Why would apt-get report "403 Forbidden" if they're still accessible? I tried re-adding the ppa through add-apt-repository which downloads the signing key again, and it still reported "403 Forbidden".

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i don't have squid or any other proxy, and still get these errors –  Berry Tsakala Jun 7 at 12:39

2 Answers 2

up vote 8 down vote accepted

So it turns out this an issue with squid-deb-proxy. Unfortunately it doesn't add ppa's and other repositories and just silently fails with a 403 error. You can fix this be either adding the repositories to squid's config files: /etc/squid-deb-proxy/mirror-dstdomain.acl or by uninstalling squid.

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Are you using proxy?

I have often experience this error, even when using main server.I noticed that this happens when apt-get process breaks for some reason. For instance when running apt-get update downloading of some file coudn't be completed. You will there after get 403 error for that particular file.

I learned that these partially downloaded files (I am not sure if they are exactly the files) during apt-get update are stored in /var/lib/apt/lists/partial/

So I did sudo rm -r /var/lib/apt/lists/partial/*(deleted all files in the directory)

After this I din't get the 403 error.

If you are getting the error when running apt-get install or apt-get upgrade or apt-get dist-upgrade

try sudo rm -r /var/cache/apt/archives/partial/*

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