ERROR: While executing gem (some::Gem) no such name (http://some.url)

Question

I'm trying to install rails using

$ sudo gem install rails

But I get this error:

ERROR:  While executing gem ... (Gem::RemoteFetcher::UnknownHostError)
no such name (https://rubygems.org/quick/Marshal.4.8/activerecord-4.0.2.gemspec.rz

What am I doing wrong? do I have to use sudo apt-get install rails instead?

I have in my system

$ ruby -v
> 2.1.11
$ gem -v 
> ruby 1.9.3p0 (2011-10-30 revision 33570) [i686-linux]

I'm following these instructions

Solved

How did I solved it?

I followed this as Mitch advised me, but after sudo apt-get install ruby1.9.3 I got that ruby -v showed ruby 1.8.7

So I did this and then I continue with

sudo gem install rails

it worked.

Answer 1

How did I solved it?

I followed this as Mitch advised me, but after sudo apt-get install ruby1.9.3 I got that ruby -v showed ruby 1.8.7

So I did this and then I continue with

sudo gem install rails

it worked.