I'm having issues trying to update my packages. I haven't used this server since last September and now I'm getting 404 errors on all the intrepid repos. How do I fix this?

Thanks

aptitude update

Err http://security.ubuntu.com intrepid-security/main Packages
  404 Not Found [IP: 91.189.92.166 80]
Err http://security.ubuntu.com intrepid-security/restricted Packages
  404 Not Found [IP: 91.189.92.166 80]
Err http://security.ubuntu.com intrepid-security/main Sources
  404 Not Found [IP: 91.189.92.166 80]
Err http://security.ubuntu.com intrepid-security/restricted Sources
  404 Not Found [IP: 91.189.92.166 80]
Err http://security.ubuntu.com intrepid-security/universe Packages
  404 Not Found [IP: 91.189.92.166 80]
Err http://security.ubuntu.com intrepid-security/universe Sources
  404 Not Found [IP: 91.189.92.166 80]
Ign http://us.archive.ubuntu.com intrepid-updates/multiverse Packages
Ign http://us.archive.ubuntu.com intrepid-updates/multiverse Sources
Err http://us.archive.ubuntu.com intrepid/main Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid/restricted Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid/main Sources
  404 Not Found [IP: 91.189.88.31 80]
Err http://security.ubuntu.com intrepid-security/multiverse Packages
  404 Not Found [IP: 91.189.92.166 80]
Err http://us.archive.ubuntu.com intrepid/restricted Sources
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid/universe Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid/universe Sources
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid/multiverse Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid/multiverse Sources
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid-updates/main Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://security.ubuntu.com intrepid-security/multiverse Sources
  404 Not Found [IP: 91.189.92.166 80]
Err http://us.archive.ubuntu.com intrepid-updates/restricted Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid-updates/main Sources
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid-updates/restricted Sources
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid-updates/universe Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid-updates/universe Sources
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid-updates/multiverse Packages
  404 Not Found [IP: 91.189.88.31 80]
Err http://us.archive.ubuntu.com intrepid-updates/multiverse Sources
  404 Not Found [IP: 91.189.88.31 80]
Reading package lists...

sources.list

# 
# deb cdrom:[Ubuntu-Server 8.10 _Intrepid Ibex_ - Release i386 (20081028.1)]/ intrepid main restricted

# deb cdrom:[Ubuntu-Server 8.10 _Intrepid Ibex_ - Release i386 (20081028.1)]/ intrepid main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://us.archive.ubuntu.com/ubuntu/ intrepid main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ intrepid universe
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid universe
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ intrepid multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid multiverse
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-updates multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://us.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository. This software is not part of Ubuntu, but is
## offered by Canonical and the respective vendors as a service to Ubuntu
## users.
# deb http://archive.canonical.com/ubuntu intrepid partner
# deb-src http://archive.canonical.com/ubuntu intrepid partner

deb http://us.archive.ubuntu.com/ubuntu/ intrepid-security main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-security main restricted
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-security universe
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-security universe
deb http://us.archive.ubuntu.com/ubuntu/ intrepid-security multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ intrepid-security multiverse