apt-get update problem on first use after Hoary preview install

[Seb Wills]

I just did a clean hoary preview from CD (but with live network). The 
installer put the following lines in /etc/apt/sources.list (I've not 
included the commented-out lines).

deb cdrom:[Ubuntu 5.04 _Hoary Hedgehog_ - Preview i386 Binary-1 (20050310)]/ hoary main restricted
deb http://gb.archive.ubuntu.com/ubuntu hoary main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu hoary main restricted
deb http://security.ubuntu.com/ubuntu hoary-security main restricted
deb-src http://security.ubuntu.com/ubuntu hoary-security main restricted

The first time I ran 'apt-get update' after booting into my new 
installation, I got:

saw at owl:~$ sudo apt-get update
Ign http://gb.archive.ubuntu.com hoary Release.gpg
Ign http://gb.archive.ubuntu.com hoary Release
Ign http://security.ubuntu.com hoary-security Release.gpg
Ign http://gb.archive.ubuntu.com hoary/main Packages
Ign http://security.ubuntu.com hoary-security Release
Ign http://gb.archive.ubuntu.com hoary/restricted Packages
Ign http://gb.archive.ubuntu.com hoary/main Sources
Ign http://security.ubuntu.com hoary-security/main Packages
Hit http://security.ubuntu.com hoary-security/restricted Packages
Hit http://security.ubuntu.com hoary-security/main Sources
Hit http://security.ubuntu.com hoary-security/restricted Sources
Hit http://security.ubuntu.com hoary-security/main Packages
Ign http://gb.archive.ubuntu.com hoary/restricted Sources
Err http://gb.archive.ubuntu.com hoary/main Packages
   Bad header line
Err http://gb.archive.ubuntu.com hoary/restricted Packages
   Bad header line
Err http://gb.archive.ubuntu.com hoary/main Sources
   Bad header line
Err http://gb.archive.ubuntu.com hoary/restricted Sources
   Bad header line
Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/hoary/main/binary-i386/Packages.gz 
Bad header line
Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/hoary/restricted/binary-i386/Packages.gz 
Bad header line
Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/hoary/main/source/Sources.gz 
Bad header line
Failed to fetch http://gb.archive.ubuntu.com/ubuntu/dists/hoary/restricted/source/Sources.gz 
Bad header line
Reading Package Lists... Done
E: Some index files failed to download, they have been ignored, or old 
ones used instead.

The network was fully up and working.

After getting the errors I checked this:

saw at owl:~$ host gb.archive.ubuntu.com
gb.archive.ubuntu.com has address 82.211.81.138

A few minutes later I tried the same apt-get update and it worked fine: 6 
"Get" lines and 6 "Hit" lines; no errors.

Someone who understands apt-get better than me can probably tell me 
exactly what the problem was. I'm posting it case it turns out to be 
a bug in the state that the installer leaves the new system in, rather 
than a temporary glitch somewhere.

seb