upgrade from feisty to gutsy failed

[rabbix2]

Tried to upgrade from feisty to gutsy using the upgrading function under System. Got the following message:
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...rce/Sources.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...86/Packages.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...86/Packages.gz 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/di...86/Packages.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...86/Packages.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...86/Packages.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...rce/Sources.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...rce/Sources.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...rce/Sources.gz 404 Not Found
Failed to fetch http://se.archive.ubuntu.com/ubuntu/...rce/Sources.gz 404 Not Found
Failed to fetch http://security.ubuntu.com/ubuntu/di...rce/Sources.gz 404 Not Found

What do I do now?

[Majorix]

Try changing your mirror from within Synaptic. If that works, that means the Swedish servers are probably down.

[sharks]

try changing it to main server(system---administration---software sources).

[rabbix2]

It is main already

[rabbix2]

Can this be of any help?:
When I open Synaptic, I get the following error message:

W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/main Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_main_b inary-i386_Packages)
W: Duplicate sources.list entry cdrom://Ubuntu 7.04 _Feisty Fawn_ - Release i386 (20070415) feisty/restricted Packages (/var/lib/apt/lists/Ubuntu%207.04%20%5fFeisty%20Fawn%5f%20-%20Release%20i386%20(20070415)_dists_feisty_restri cted_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com feisty-security/main Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_feisty-security_main_binary-i386_Packages)
W: Duplicate sources.list entry http://security.ubuntu.com feisty-security/restricted Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_feisty-security_restricted_binary-i386_Packages)

[rabbix2]

Does it help to make a "fresh install" of gutsy instead? If I do, will I loose all the files and programs I have installed since I upgraded to feisty?