server@siva-desktop:~$ sudo apt-get install vim
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package vim is a virtual package provided by:
  vim-nox 2:7.2.330-1ubuntu3
  vim-gtk 2:7.2.330-1ubuntu3
You should explicitly select one to install.
E: Package vim has no installation candidate
server@siva-desktop:~$ sudo apt-get install vim-nox
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
  vim-nox: Depends: vim-runtime (= 2:7.2.330-1ubuntu3) but it is not installable
           Depends: libruby1.8 (>= 1.8.7.249) but it is not installable
E: Broken packages
server@siva-desktop:~$