Problemas con apt

[Pedro Gauna]

Hola listeros,

tengo un problema con apt, cada vez que le doy
$ apt-get update
me tira el siguiente mensaje:

Hit http://archive.ubuntu.com warty/universe Release
99% [2 Sources gzip 0]
gzip: stdin: not in gzip format
Err http://archive.ubuntu.com warty/restricted Sources
  Sub-process gzip returned an error code (1)
Fetched 1025B in 4s (219B/s)
Failed to fetch 
http://archive.ubuntu.com/ubuntu/dists/warty/restricted/source/Sources.gz  
Sub-process gzip returned an error code (1)
Reading Package Lists... Done
E: Some index files failed to download, they have been ignored, or old 
ones used instead.

Estos son mis fuentes:

#deb cdrom:[Ubuntu 4.10 _Warty Warthog_ - Unofficial i386 Binary-1 
(20040915)]/ unstable main restricted


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

## Uncomment the following two lines to fetch updated software from the 
network
## and be able to use more than 12000 unsupported packages from the 
universe archive.
deb http://archive.ubuntu.com/ubuntu warty main restricted universe
deb-src http://archive.ubuntu.com/ubuntu warty main restricted universe

deb http://security.ubuntu.com/ubuntu warty-security main restricted
deb-src http://security.ubuntu.com/ubuntu warty-security main restricted

Googleé un poco pero lo único que encontré fue algo al respecto de 
fuentes repetidas, pero no es eso. ¿Alguna idea?
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