I tried a bit harder. This is dpkg's output: /home/user # dpkg -i --force-depends /media/mmc2/numptyphy sics_0.1_armel.deb Selecting previously deselected package numptyphysics. (Reading database ... 15495 files and directories currentl y installed.) Unpacking numptyphysics (from .../numptyphysics_0.1_armel. deb) ... dpkg-deb: subprocess paste killed by signal (Broken pipe) dpkg: error processing /media/mmc2/numptyphysics_0.1_armel .deb (--install): short read in buffer_copy (backend dpkg-deb during `./usr /bin/numptyphysics') Errors were encountered while processing: /media/mmc2/numptyphysics_0.1_armel.deb /home/user # I don't know what that means, other than that I --probably -- don't have Numptyphysics installed.