Is there some missing repository you need to add to the Windows Ubuntu? Every time I've tried to install some one-off tool Stackoverflow has suggested (yesterday it was ncftp, the other day it was some ssh configuration, ifconfig isn't there) apt can't find it.
it's the same userland as "real" Ubuntu, so apt will give you the same results on both.
Perhaps do a "sudo apt-get update" (updates the local resources of apt, not the packages themselves) so that when you do a "apt search" or "show" in the future it has something to show?
