It seems the file you are looking for is in the linux-kernel-headers package (as shown here http://packages.ubuntu.com/cgi-bin/search_contents.pl?word=unaligned.h&searchmode=searchfiles&case=insensitive&version=edgy&arch=i386)
It seems the file you are looking for is in the linux-kernel- headers package (as shown here http:// packages. ubuntu. com/cgi- bin/search_ contents. pl?word= unaligned. h&searchmode= searchfiles& case=insensitiv e&version= edgy&arch= i386)