The following will install the latest versions of Ruby, Rails and Mongrel on a Ubuntu machine:
# sudo apt-get install build-essential libreadline5-dev zlib1g-dev libncurses5-dev
# wget ftp://ftp.ruby-lang.org/pub/ruby/ruby-1.8.6.tar.gz (stable ruby)
# wget http://rubyforge.org/frs/download.php/11289/rubygems-0.9.4.tgz
# tar -xzf ruby-1.8.6.tar.gz
# cd ruby-1.8.6
# vim ext/Setup
Uncomment the entries for readline and zlib – save changes and exit
# ./configure –prefix=/usr (we want to install in /usr/bin [...]
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