I did apt-get update and here's what I got
giorgi@ubuntu:~$ sudo apt-get update
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maverick Release.gpg
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maverick/main Translation-en
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maverick/main Translation-en_US
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maverick-security Release.gpg
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maverick-security/main Translation-en
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maverick-security/main Translation-en_US
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maverick-security/multiverse Translation-en
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maverick-security/multiverse Translation-en_US
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maverick-security/restricted Translation-en
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maverick-security/restricted Translation-en_US
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maverick-security/universe Translation-en
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maverick Release
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maverick Release.gpg
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maverick/main Translation-en
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maverick/main Translation-en_US
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maverick/multiverse Translation-en
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maverick/multiverse Translation-en_US
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maverick/restricted Translation-en
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maverick/restricted Translation-en_US
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maverick/universe Translation-en
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maverick-security/universe Translation-en_US
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maverick-security Release
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maverick/main Sources
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maverick/universe Translation-en_US
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maverick-updates Release.gpg
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maverick-updates/main Translation-en
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maverick-updates/main Translation-en_US
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maverick-updates/multiverse Translation-en
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maverick-updates/multiverse Translation-en_US
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maverick-updates/restricted Translation-en
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maverick-updates/restricted Translation-en_US
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maverick/main i386 Packages
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maverick-updates/universe Translation-en
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maverick-security/main Sources/DiffIndex
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maverick-updates/universe Translation-en_US
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maverick Release
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maverick-updates Release
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maverick/main Sources
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maverick-security/restricted Sources/DiffIndex
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maverick-security/universe Sources
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maverick-security/multiverse Sources
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maverick-security/main i386 Packages/DiffIndex
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maverick-security/restricted i386 Packages/DiffIndex
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maverick-security/universe i386 Packages
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maverick-security/multiverse i386 Packages
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maverick/main i386 Packages
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maverick/main Sources
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maverick/restricted Sources
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maverick-security/main Sources
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maverick-security/restricted Sources
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maverick-security/universe Sources
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maverick/main Sources
404 Not Found
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maverick-security/multiverse Sources
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maverick-security/main i386 Packages
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maverick-security/restricted i386 Packages
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maverick/universe Sources
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maverick/multiverse Sources
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maverick/main i386 Packages
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maverick/restricted i386 Packages
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maverick/universe i386 Packages
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maverick/multiverse i386 Packages
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maverick-updates/main Sources
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maverick-updates/restricted Sources
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maverick-updates/universe Sources
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maverick-security/universe i386 Packages
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maverick/main i386 Packages
404 Not Found
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maverick-security/main Sources
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maverick-security/restricted Sources
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maverick-security/universe Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick-security/multiverse Sources
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maverick-updates/multiverse Sources
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maverick-updates/main i386 Packages
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maverick-updates/restricted i386 Packages
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maverick-updates/universe i386 Packages
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maverick-updates/multiverse i386 Packages
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maverick/main Sources
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maverick/restricted Sources
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maverick/universe Sources
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maverick/multiverse Sources
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maverick-security/main i386 Packages
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maverick-security/restricted i386 Packages
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maverick-security/universe i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-security/multiverse i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-security/main Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick-security/restricted Sources
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maverick/main i386 Packages
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maverick/restricted i386 Packages
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maverick/universe i386 Packages
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maverick/multiverse i386 Packages
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maverick-updates/main Sources
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maverick-updates/restricted Sources
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maverick-updates/universe Sources
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maverick-updates/multiverse Sources
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maverick-updates/main i386 Packages
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maverick-security/main i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-security/restricted i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/restricted i386 Packages
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maverick-updates/universe i386 Packages
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maverick-updates/multiverse i386 Packages
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maverick/main Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick/restricted Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick/universe Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick/multiverse Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick/main i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick/restricted i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick/universe i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick/multiverse i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/main Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/restricted Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/universe Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/multiverse Sources
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/main i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/restricted i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/universe i386 Packages
404 Not Found [IP: 91.189.91.13 80]
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maverick-updates/multiverse i386 Packages
404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch
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404 Not Found [IP: 91.189.91.13 80]
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404 Not Found [IP: 91.189.91.13 80]
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404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch
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404 Not Found [IP: 91.189.91.13 80]
W: Failed to fetch
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404 Not Found [IP: 91.189.91.13 80]
E: Some index files failed to download, they have been ignored, or old ones used instead.
giorgi@ubuntu:~$
try updating your repository first with "apt-get update" .
any idea?