Problem with "Pool" repository

[Aru]

Firstly apologies in advance for any stupid things I say, as I am very new to Ubuntu.

I have been trying to install KDE using Synaptic.
I have used the updated list, but I keep getting failed packages see below
W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/a/arts/libarts1c2_1.4.3-0ubuntu1_i386.deb
Bad header line


W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/k/k3b/k3b_0.12.7-1ubuntu1~breezy1_i386.deb



W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/k/kdepim/libkleopatra0a_3.4.3-0ubuntu3_i386.deb



W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/k/kdepim/kaddressbook_3.4.3-0ubuntu3_i386.deb



W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/k/kaffeine/kaffeine-gstreamer_0.7.1-1.3ubuntu1~breezy1_i386.deb



W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/k/kdebase/kappfinder_3.4.3-0ubuntu6_i386.deb



W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/k/kdepim/karm_3.4.3-0ubuntu3_i386.deb



W: Failed to fetch http://archive.ubuntu.com/ubuntu/pool/main/k/kdebase/kate_3.4.3-0ubuntu6_i386.deb


Any ideas?