I have installed Ubuntu 12.04 in my computer few days back. from then i tried to install few programs through Ubuntu software center but it showed that no internet connection even though i was connected to internet. Then i came to know that vi editor will be required to set the system configuration in which i will be able to save my password and proxy. apart from that i also tried to install the programs through terminal but still same problem occurred as it says this is not a candidate for install.

i tried to install Vim using command sudo apt-get instal Vim-nox but it shows that broken package and showed many failures.

please help me out of this.... thank you