I can't install vim on my terminal

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http://askubuntu.com – whenever i try to execute vim, the terminal shows this: The program 'vim' can be found in the following packages: * vim * vim-gnome * vim-tiny * vim-athena * vim-gtk * vim-nox Try: sudo apt-get install <selected package> So I tried what most of my classmates had done, sudo apt-get update and sudo apt-get install vim but it didn't work. The terminal shows this message after I entered sudo apt-get install vim Reading package lists... Done Building dependency tree Reading state information... Done Package vim is not available, but is referred to by another package. This may (HowTos)