Bug#272238: Subject: apt: woody->sarge upgrade

[Diego Calleja <diegocg@teleline.es>]

Followup-For: Bug #187889
Package: apt
Version: 0.5.27

I have some friend on IRC wich got that message:
  'E: Invalid record in the preferences file, no Package header', 

after upgrading woody to sarge. It seems that some script
did touch /etc/apt/preferences, and suddenly in the upgrade
apt-get sttoped working with that message. I think it's a
quite critical bug for the sarge release. people should be
able to upgrade to sarge without problems - the scripts shouldn't
create a void /etc/apt/preferences file if they're not going
to put something on it, since apt breaks if they're nothing there.
Another option would be to modify apt so it doesnt stops if there're
nothing in the file, but I guess the first option is much easier now
that sarge is going to be released.