Ubuntu: Use Chris Lea PPA for node package
Ubuntu: Use Chris Lea PPA for node package

The node package that ships with Ubuntu has unfortunate permissions
errors that cause canvas' npm install to fail.  Because of that we will
use Chris Lea's nodejs PPA

Also try to repair a permissions error that happens on the ~/.npm
directory that crops up on Ubuntu

FreedomBen/canvas-development-tools,abhinay100/canvas-development-tools