Get:8 http://security.ubuntu.com dapper-security/universe Packages [5271B]
99% [Working]                                                       20.8kB/s 0sbzip2: (stdin) is not a bzip2 file.
Err http://security.ubuntu.com dapper-security/universe Packages
  Sub-process bzip2 returned an error code (2)
Fetched 8208B in 6s (1346B/s)
Failed to fetch http://security.ubuntu.com/ubuntu/dists/dapper-security/universe/binary-i386/Packages.bz2  Sub-process bzip2 returned an error code (2)
Reading package lists... Done
W: GPG error: http://www.beerorkid.com dapper Release: The following signatures were invalid: BADSIG 18B52FE3521A9C7C Justin Hayes (Automatix Repository Master) <wildtangent@w1ldt4ng3nt.net>
W: Duplicate sources.list entry http://security.ubuntu.com dapper-security/universe Packages (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_dapper-security_universe_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.


this was after a sudo apt-get update and after re logging