error de descarga apt

[<Xabim@ono.com>]

hola, estoy instalando debian desde internet, y me lo he instalado todo
bien, pero tiro a instalar el kde 3.1.4 y cuando quedaba poco para
bajarse, el apt me da este error:

Get:1 http://download.kde.org stable/main libqt3-mt 3:3.1.2-0woody1 [2648kB]
Err http://download.kde.org stable/main libarts1 1.1.4-0woody1
  0 Partial Content
Err http://download.kde.org stable/main libartsc0 1.1.4-0woody1
  0 Partial Content
Fetched 1B in 41s (0B/s)

Failed to fetch
http://download.kde.org/stable/3.1.4/Debian/pool/main/q/qt-x11-free/libqt3-mt_3.1.2-0woody1_i386.deb
 Size mismatch
Failed to fetch
http://download.kde.org/stable/3.1.4/Debian/pool/main/a/arts/libarts1_1.1.4-0woody1_i386.deb
 0 Partial Content
Failed to fetch
http://download.kde.org/stable/3.1.4/Debian/pool/main/a/arts/libartsc0_1.1.4-0woody1_i386.deb
 0 Partial Content
E: Unable to fetch some archives, maybe run apt-get update or try with
--fix-missing?

Que puede pasar¿?¿?

gracias.