Installing Ruby 1.9 from Source on Ubuntu in Five Minutes

This is on a clean Ubuntu Lucid Lynx image.

• sudo apt-get install gcc libzlib-ruby libssl-dev libxslt-dev libxml2-dev libmemcached-dev libsasl2-dev libmemcached-dbg  libpq-dev libcurl4-gnutls-dev libyaml-dev make
• wget LINK_TO_RUBY_TAR
• Find tar link here: http://www.ruby-lang.org/en/downloads/
• tar -zxvf rubyXXXX.tar.gz
• cd rubyXXXX
• ./configure
• make
• sudo make install

That's it, try running "ruby -v" to see the ruby version.

I recommend doing the following to enable SSL support (only takes a few seconds):

• cd ext/openssl
• ruby extconf.rb
• make
• sudo make install

And lastly, update the gem system:

• sudo gem update --system