Package 'samba' is virtual - Error when installing Samba

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http://askubuntu.com – I'm trying to set up an Ubuntu computer as a centralised storage for a few Windows 7 computers on my network. I did a fresh install of Ubuntu 12.04 LTS. However, when I try to install Samba through the terminal using sudo apt-get install samba, I get this error: Package samba is not available, but is referred to by another package. If I try to install it by clicking on the directory I want to share, then checking "Share this folder" to trigger the "Sharing service is not installed, Install Server" dialogue box, it results in these errors: Package 'samba' is virtual. Package 'libpam-smbpas (HowTos)