i ahve just got a pc with linux ubuntu 7.04. i am quite new to linux, when i try to install anything or updates i keep getting cannot download all repository indexes.
i typed sudo apt-get update in terminal and this is what i got:

fred@fred-desktop:~$ sudo apt-get update
Password:
Ign http://archive.ubuntu.com feisty Release.gpg
Ign http://archive.ubuntu.com feisty/main Translation-en_GB
Ign http://archive.ubuntu.com feisty/universe Translation-en_GB
Ign http://archive.ubuntu.com feisty/universe Translation-en_GB
Ign http://archive.ubuntu.com feisty-updates Release.gpg
Ign http://archive.ubuntu.com feisty-updates/main Translation-en_GB
Ign http://archive.ubuntu.com feisty-security Release.gpg
Ign http://archive.ubuntu.com feisty-security/main Translation-en_GB
Ign http://archive.ubuntu.com feisty-security/universe Translation-en_GB
Ign http://archive.ubuntu.com feisty Release
Ign http://archive.ubuntu.com feisty-updates Release
Ign http://archive.ubuntu.com feisty-security Release
Ign http://archive.ubuntu.com feisty/main Packages
Ign http://archive.ubuntu.com feisty/universe Packages
Ign http://archive.ubuntu.com feisty/universe Packages
Ign http://archive.ubuntu.com feisty-updates/main Packages
Ign http://archive.ubuntu.com feisty-security/main Packages
Ign http://archive.ubuntu.com feisty-security/universe Packages
Err http://archive.ubuntu.com feisty/main Packages
404 Not Found [IP: 91.189.92.189 80]
Err http://archive.ubuntu.com feisty/universe Packages
404 Not Found [IP: 91.189.92.189 80]
Err http://archive.ubuntu.com feisty/universe Packages
404 Not Found [IP: 91.189.92.189 80]
Err http://archive.ubuntu.com feisty-updates/main Packages
404 Not Found [IP: 91.189.92.189 80]
Err http://archive.ubuntu.com feisty-security/main Packages
404 Not Found [IP: 91.189.92.189 80]
Err http://archive.ubuntu.com feisty-security/universe Packages
404 Not Found [IP: 91.189.92.189 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...86/Packages.gz 404 Not Found [IP: 91.189.92.189 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...86/Packages.gz 404 Not Found [IP: 91.189.92.189 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...86/Packages.gz 404 Not Found [IP: 91.189.92.189 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...86/Packages.gz 404 Not Found [IP: 91.189.92.189 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...86/Packages.gz 404 Not Found [IP: 91.189.92.189 80]
Failed to fetch http://archive.ubuntu.com/ubuntu/dis...86/Packages.gz 404 Not Found [IP: 91.189.92.189 80]
Reading package lists... Done
E: Some index files failed to download, they have been ignored, or old ones used instead.
fred@fred-desktop:~$

tried updating ubuntu and get the same, could not download all repository indexs.
if anyone could offer a solution, it would be much appreciated.

thanks