How to Install Ruby 2.0.0 Correctly on Ubuntu 12.04

How do I install ruby 2.0.0 correctly on Ubuntu 12.04?

follow below steps

sudo apt-get -y update
sudo apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
wget http://cache.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p481.tar.gz
tar -xvzf ruby-2.0.0-p481.tar.gz
cd ruby-2.0.0-p481/
./configure --prefix=/usr/local
make
sudo make install

installed ruby using apt-get install ruby 2.0.0 succeeded but not using correct ruby version

If you're new to linux I'd recommend using something like RVM (Ruby Version Manager) to install ruby. It makes it easier to switch ruby versions and manage multiple gemsets.

To install RVM with the latest (stable) ruby:

\curl -L https://get.rvm.io | bash -s stable --ruby

then check which rubies are installed by using

rvm list

you can then switch ruby versions using

rvm use 2.0.0 --default

with the --default flag overriding any system ruby.

Update

If you really don't want to use RVM, then use

sudo apt-get install checkinstall

wget -c http://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p0.tar.gz
tar -xzf ruby-2.0.0-p0.tar.gz
cd ruby-2.0.0-p0

./configure   
make

sudo checkinstall -y \
  --pkgversion 2.0.0-p0 \
  --provides "ruby-interpreter"

checkinstall will package the source, making it easier to remove in the future

You'll then need to add the Ruby binaries to your path, by editing the env file:

sudo nano /etc/environment

add /usr/local/ruby/bin

PATH="/usr/local/ruby/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

then run

source /etc/environment

to reload the file, and check your ruby version with

ruby -v

ubuntu 12.04 ruby 2.0 rails: Could not find 'thread_safe'

Seems you are using 2.1.0 version of rubygems. It's not bug of tread_safe or atomic gems, but it's bug of rubygems 2.1.0. Try to install older version (like 2.0.8). How to do this:

gem uninstall rubygems-update
gem install rubygems-update --version 2.0.8
update_rubygems

How to install Ruby 2 on Ubuntu without RVM

sudo apt-get -y update
sudo apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
wget http://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p451.tar.gz
tar -xvzf ruby-2.0.0-p451.tar.gz
cd ruby-2.0.0-p451/
./configure --prefix=/usr/local
make
sudo make install

from here How do I install ruby 2.0.0 correctly on Ubuntu 12.04?

UPDATE

for ruby 2.1.5

sudo apt-get -y update
sudo apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
wget http://ftp.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz 
tar -xvzf ruby-2.1.5.tar.gz
cd ruby-2.1.5/
./configure --prefix=/usr/local
make
sudo make install

if you are still seeing an older ruby check your symlink
ls -la /usr/bin/ruby from hector

Installing Ruby 2.0.0 using RVM

Your rvm is probably not up to date, and by doing so the list of installable rubies also. Rvm probably took the best match, that was Rubinius 2

When you do

rvm list known

You obtain the list of known rubies that you can install

This list is updated at the same time you update rvm. Then you need to update rvm before installing MRI Ruby 2.0.0

rvm get stable

Forbidden - Ruby 2.0.0 Rails 4.0.0 Nginx Passenger on Ubuntu 12.04

So it started to work. The weird part is that I can't really tell what caused it to start working. I've made a few mistakes along the way that I have fixed. One was adding basic auth incorrectly to the site configuration:

server {
    listen 80;
    root /var/www/default/public;
    server_name s.dev;

    location / {
       auth_basic "Restricted";
       auth_basic_user_file /var/www/default/.htpasswd;

    passenger_enabled on;       <------ did not remember to add this
    }


    passenger_enabled on;
    rails_env development;
}

Another thing was to add a user to nginx.conf and make this user the owner of /var/www/default - although I am pretty sure that this was one of the things I've tried when things were not working

Thank you everyone for helping out

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