Bug#919960: sync packages

[積丹尼 Dan Jacobson]

I guess there is no way to solve it currently,
as one part will get there faster than the other parts no matter what,
and the user will get a message that that part cannot be upgraded yet.
I guess unless another layer is added to the ftp server, saying wait for
all packages in the group to arrive, before letting users know via their
apt-get.