how to enable universe packages through black prompt

[ahmed fawzy]

hello
i have a problem during installtion of ubuntu , and i want to enable universe packages to install cabextract
when i write this:
"sudo apt-get install cabextract" =>tell me  "Couldn't find package cabextract".
so unverse packege must be enabled plz tell me the code to enable it plzzzz
thx

 
"Ahmed Fawzy Mohamed Ragab"
Computer Engineering Student
Computer Engineering department
Faculty Of Engineering - Cairo University
E-mails:
a.fawzy.ce at gmail.com 
thedarkangel55 at yahoo.com
vampire_ahmed3 at hotmail.com


       
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