Apache Cassandra install causes dependency failure

Apache Cassandra install causes dependency failure

I am trying to install Cassandra on ubuntu machine,
I have set entries in /etc/apt/sources.list file
deb http://www.apache.org/dist/cassandra/debian 10x main
deb-src http://www.apache.org/dist/cassandra/debian 10x main
but when i run apt-get install Cassandra after update i am getting following error message.
The following packages have unmet dependencies:
 cassandra : Depends: jsvc (>= 1.0) but it is not going to be installed
             Depends: libcommons-daemon-java (>= 1.0) but it is not going to be installed
             Depends: libjna-java but it is not going to be installed
 syslinux-common : Breaks: syslinux (< 2:4.05+dfsg-2) but 4.02-8 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
I have also tried -f option, but it won't worked for me.
what is going wrong?