apt-get -f install fails

[Paul John Biciunas]

I have a slink/potato hybrid. Also, /etc/apt/sources.list is
pointing at the http://www.us.debian.org/debian potato ...
unstable distribution, I did an apt-get update, followed
by apt-get -f install.  Seven other packages installed
(including g++ and binutils), but it failed on xpm4g-dev.

I ran apt-get -f install again to capture:

 eggplant# apt-get -f install
 Reading Package Lists... Done
 Building Dependency Tree... Done
 Correcting dependencies... Done
 The following extra packages will be installed:
   xpm4g-dev
 1 packages upgraded, 0 newly installed, 0 to remove and 222 not
upgraded.
 8 packages not fully installed or removed.
 Need to get 0B/100.0kB of archives. After unpacking 41.0kB will be
used.
 Do you want to continue? [Y/n] y
 E: Internal Error, ordering was unable to handle the media swap

What exactly does the error mean, and why won't xpm4g-dev install even
tho
it was apt that told me I  needed it?

TIA
-Paul

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