root@smtp:/etc/apt# apt-get update
Get:1 http://security.ubuntu.com dapper-security Release.gpg [191B]
Get:2 http://us.archive.ubuntu.com dapper Release.gpg [189B]
Get:3 http://security.ubuntu.com dapper-security Release [50.9kB]
Get:4 http://us.archive.ubuntu.com dapper-updates Release.gpg [191B]
Get:5 http://us.archive.ubuntu.com dapper-backports Release.gpg [191B]
Hit http://us.archive.ubuntu.com dapper Release
Hit http://us.archive.ubuntu.com dapper-updates Release
Get:6 http://security.ubuntu.com dapper-security/main Packages [109kB]
Hit http://us.archive.ubuntu.com dapper-backports Release
Hit http://us.archive.ubuntu.com dapper/main Packages
Hit http://us.archive.ubuntu.com dapper/restricted Packages
Hit http://us.archive.ubuntu.com dapper/main Sources
Hit http://us.archive.ubuntu.com dapper/restricted Sources
Get:7 http://security.ubuntu.com dapper-security/restricted Packages [7250B]
Get:8 http://security.ubuntu.com dapper-security/main Sources [22.1kB]
Ign http://security.ubuntu.com dapper-security/main Sources
Hit http://us.archive.ubuntu.com dapper/universe Packages
Get:9 http://security.ubuntu.com dapper-security/restricted Sources [983B]
Hit http://us.archive.ubuntu.com dapper/universe Sources
Get:10 http://security.ubuntu.com dapper-security/main Sources [25.6kB]
Hit http://us.archive.ubuntu.com dapper-updates/main Packages
93% [10 Sources gzip 0] [Waiting for headers]
gzip: stdin: not in gzip format
Err http://security.ubuntu.com dapper-security/main Sources
  Sub-process gzip returned an error code (1)
Hit http://us.archive.ubuntu.com dapper-updates/restricted Packages
Hit http://us.archive.ubuntu.com dapper-updates/main Sources
Hit http://us.archive.ubuntu.com dapper-updates/restricted Sources
Hit http://us.archive.ubuntu.com dapper-backports/main Packages
Hit http://us.archive.ubuntu.com dapper-backports/restricted Packages
Hit http://us.archive.ubuntu.com dapper-backports/universe Packages
Hit http://us.archive.ubuntu.com dapper-backports/multiverse Packages
Hit http://us.archive.ubuntu.com dapper-backports/main Sources
Hit http://us.archive.ubuntu.com dapper-backports/restricted Sources
Hit http://us.archive.ubuntu.com dapper-backports/universe Sources
Hit http://us.archive.ubuntu.com dapper-backports/multiverse Sources
Fetched 193kB in 6s (31.2kB/s)
Failed to fetch http://security.ubuntu.com/ubuntu/dists/dapper-security/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.
root@smtp:/etc/apt# gzip
gzip: compressed data not written to a terminal. Use -f to force compression.
For help, type: gzip -h