i m also getting the exact same message when i try to install kmplayer...xsltproc missing...i tried to install xsltproc manually from the terminal but it throws a strange error against that...
"Package xsltproc is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package xsltproc has no installation candidate"