Rvm install fails due to errors in apt-get update
Your RVM installation is failing because apt-get update has errors. The simplest way to fix this is
1) Identify the errors during apt-update
sudo apt-get update | grep "Failed"
2) Comment out the failing ppa’s in either
etc/apt/sources.list or look in etc/apt/sources.list.d/ for the files ending with .list that have a name similar to the repos that are erroring out.