How to change OS kernel parameter "semmni" in xubuntu

Question

I'm trying to install Oracle 11g on my xubuntu system but it gives me error

This is a prerequisite condition to test whether the OS kernel parameter 'semmni' is properly set
Expected Value : 128
Actual Value : 0

I tried to make changes in sysctl.conf file but in that file I can't find anything.

EDIT: I got to know that semmni value is 128 after i put this command - sysctl -a | grep "kernel.sem"

but when i run oracle 11g it says that actual value : 0

Any help will be appreciated

Thank You