Falied installation

Hi guys, i need your help urgently,had issues with my erpnext installation so i deleted everything and am trying to do a fresh install an am getting the following errors.

The following packages have unmet dependencies:
nodejs : Conflicts: npm
E: Unable to correct problems, you have held broken packages.

am using ubuntu 14.

Try searching google for help on npm

You should engage a freelancer if you need urgent help and have a budget.