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I am using ubuntu 10.04 when I follow https://launchpad.net/~do-core/+archive/ppa. I did:

$ sudo add-apt-repository ppa:do-core/ppa
$ sudo apt-get update

I get this error:

Ign http://ppa.launchpad.net lucid/main Packages
Err http://ppa.launchpad.net lucid/main Packages
  404  Not Found
Fetched 5,940B in 1s (3,577B/s)
W: Failed to fetch http://ppa.launchpad.net/do-core/ppa/ubuntu/dists/lucid/main/binary-amd64/Packages.gz  404  Not Found

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

Please tell me how can I fix it.

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The short answer is that you can't.

If you try to filter the package list by series, you'll notice that Lucid isn't listed. The lucid/main packages don't exist (further evidence here). There's a message on the Gnome-Do mailing list that says the developers are in the middle of rewriting it. You can try building it from source.

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