I've never seen this type of error which has suddenly popped up. When I run aptitude update, it starts out normal enough and then blows up. Here is the full output.
Hit http://security.debian.org squeeze/updates Release.gpg Ign http://security.debian.org/ squeeze/updates/main Translation-en Ign http://security.debian.org/ squeeze/updates/main Translation-en_US Hit http://security.debian.org squeeze/updates Release Get:1 http://volatile.debian.org squeeze/volatile Release.gpg [7,229 B] Get:2 http://volatile.debian.org/debian-volatile/ squeeze/volatile/main Translation-en [7,229 B] Get:3 http://volatile.debian.org/debian-volatile/ squeeze/volatile/main Translation-en_US [7,229 B] bzip2: (stdin) is not a bzip2 file. Hit http://security.debian.org squeeze/updates/main Sources Ign http://volatile.debian.org/debian-volatile/ squeeze/volatile/main Translation-en bzip2: (stdin) is not a bzip2 file. Ign http://volatile.debian.org/debian-volatile/ squeeze/volatile/main Translation-en_US Hit http://ftp.de.debian.org squeeze Release.gpg Ign http://ftp.de.debian.org/debian/ squeeze/main Translation-en Ign http://ftp.de.debian.org/debian/ squeeze/main Translation-en_US Hit http://security.debian.org squeeze/updates/main i386 Packages Ign http://ftp.de.debian.org/debian/ squeeze/non-free Translation-en Ign http://ftp.de.debian.org/debian/ squeeze/non-free Translation-en_US Hit http://ftp.de.debian.org squeeze Release Hit http://ftp.de.debian.org squeeze/main i386 Packages Get:4 http://volatile.debian.org squeeze/volatile Release [7,229 B] Ign http://volatile.debian.org squeeze/volatile Release Hit http://ftp.de.debian.org squeeze/non-free i386 Packages Hit http://ftp.us.debian.org squeeze Release.gpg Ign http://ftp.us.debian.org/debian/ squeeze/main Translation-en Ign http://ftp.us.debian.org/debian/ squeeze/main Translation-en_US Hit http://ftp.us.debian.org squeeze Release Get:5 http://volatile.debian.org squeeze/volatile/main Sources [7,229 B] bzip2: (stdin) is not a bzip2 file. Err http://volatile.debian.org squeeze/volatile/main Sources Sub-process /bin/bzip2 returned an error code (2) Hit http://ftp.us.debian.org squeeze/main Sources Hit http://ftp.us.debian.org squeeze/main i386 Packages Get:6 http://volatile.debian.org squeeze/volatile/main i386 Packages [7,229 B] bzip2: (stdin) is not a bzip2 file. Err http://volatile.debian.org squeeze/volatile/main i386 Packages Sub-process /bin/bzip2 returned an error code (2) Fetched 21.7 kB in 2s (7,335 B/s) Reading package lists... W: GPG error: http://volatile.debian.org squeeze/volatile Release: The following signatures were invalid: NODATA 1 NODATA 2 -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/201205032012.q43kchvr006...@x.it.okstate.edu