Only some packages had to be additionaly downloaded!
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No, its the fault of the package maintainer(s) who forgot to add a
proper "Replaces: dvd+rw-tools ( << 7.1-8 )" to growisofs after moving files around in the package…
dpkg complains then that two packages want to own the same file - which is impossible.
That a second run fixes it is just because apt installs the new versions of both packages (and leaves them in a broken state after the first run) and in the new version of the dvd+rw-tools the file is gone, so only one package includes the file and dpkg is happy.
A replaces had hinted APT that it should install the new version of dvd+rw-tools before growisofs -- or if this is impossible it has told dpkg at least that it is okay that it overrides files of the other package.
An upload fixing this issue is in the archive already btw.
_________________ MfG. DonKult
"I never make stupid mistakes. Only very, very clever ones." ~ The Doctor