root@dailicious:~# sudo apt-get install gcc g++ build-essential libssl-dev libreadline5-dev zlib1g-dev linux-headers-generic libsqlite3-dev
root@dailicious:~# wget ftp://ftp.ruby-lang.org//pub/ruby/1.9/ruby-1.9.2-p136.tar.gz
root@dailicious:~# tar -xvzf ruby-1.9.2-p136.tar.gz
root@dailicious:~# cd ruby-1.9.2-p136/
root@dailicious:~ruby-1.9.2-p136# ./configure —prefix=/usr/local/ruby
root@dailicious:~ruby-1.9.2-p136# make && sudo make install
root@dailicious:~ruby-1.9.2-p136# gedit /etc/environment
Add in the PATH variable that path - /usr/local/ruby/bin, should look something like this:
PATH=”/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/ruby/bin”
root@dailicious:~ruby-1.9.2-p136# source /etc/environment
To check the version of ruby use:
root@dailicious:~ruby-1.9.2-p136# ruby -v
Now create a symbolic link for ruby and gem program. Ruby 1.9.2 is already includes Rubygems, so you do not have to install it.
root@dailicious:~ruby-1.9.2-p136# sudo ln -s /usr/local/ruby/bin/ruby /usr/local/bin/ruby
root@dailicious:~ruby-1.9.2-p136# sudo ln -s /usr/local/ruby/bin/gem /usr/bin/gem
Now install rails 3, we use rails version 3.0.7
root@dailicious:~ruby-1.9.2-p136# gem install rails —version 3.0.7
Source: http://torqueo.net/installing-ruby-192-and-rails-3-stable-on-ubuntu/
