Something

Ign cdrom://[Debian GNU/Linux 4.0 r0 _Etch_ - Official i386 kde-CD Binary-1 20070407-12:10] etch Release.gpg
Ign cdrom://[Debian GNU/Linux 4.0 r0 _Etch_ - Official i386 kde-CD Binary-1 20070407-12:10] etch Release
Ign cdrom://[Debian GNU/Linux 4.0 r0 _Etch_ - Official i386 kde-CD Binary-1 20070407-12:10] etch/contrib Packages/DiffIndex
Ign cdrom://[Debian GNU/Linux 4.0 r0 _Etch_ - Official i386 kde-CD Binary-1 20070407-12:10] etch/main Packages/DiffIndex
Get:1 http://www.backports.org etch-backports Release.gpg [189B]
Get:2 http://security.debian.org etch/updates Release.gpg [189B]
Get:3 http://ftp.us.debian.org etch Release.gpg [378B]
Hit http://www.backports.org etch-backports Release
Hit http://security.debian.org etch/updates Release
Hit http://ftp.us.debian.org etch Release
Hit http://www.backports.org etch-backports/main Packages/DiffIndex
Get:4 http://www.debian-multimedia.org etch Release.gpg [189B]
Ign http://ftp.us.debian.org etch/main Packages/DiffIndex
Ign http://security.debian.org etch/updates/main Packages/DiffIndex
Hit http://www.backports.org etch-backports/contrib Packages/DiffIndex
Hit http://www.backports.org etch-backports/non-free Packages/DiffIndex
Ign http://security.debian.org etch/updates/contrib Packages/DiffIndex
Ign http://security.debian.org etch/updates/main Sources/DiffIndex
Hit http://www.debian-multimedia.org etch Release
Ign http://ftp.us.debian.org etch/main Sources/DiffIndex
Hit http://ftp.us.debian.org etch/main Packages
Ign http://security.debian.org etch/updates/contrib Sources/DiffIndex
Hit http://security.debian.org etch/updates/main Packages
Ign http://www.debian-multimedia.org etch/main Packages/DiffIndex
Hit http://ftp.us.debian.org etch/main Sources
Hit http://security.debian.org etch/updates/contrib Packages
Hit http://www.debian-multimedia.org etch/main Packages
Ign http://security.debian.org etch/updates/main Sources
Hit http://security.debian.org etch/updates/contrib Sources
Get:5 http://security.debian.org etch/updates/main Sources [16.7kB]
99% [5 Sources gzip 0]
gzip: stdin: not in gzip format
Err http://security.debian.org etch/updates/main Sources
  Sub-process gzip returned an error code (1)
Fetched 5B in 3s (2B/s)
Failed to fetch http://security.debian.org/dists/etch/updates/main/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.

update available list script returned error exit status 1.
Press <enter> to continue.