Here's how I've set up my laptop, running Ubuntu 8.10 (Intrepid Ibex) for Ruby on Rails development. You'll need to run the following commands from the command-line as root. These commands worked for me, but I take no responsibility if you trash your box by doing this ;)
There is some duplication here, because I sometimes setup servers with different sub-sets of the software I use on my development laptop. Don't worry about this. It does no harm if you tell apt-get or aptitude to install the same package twice - it will just ignore you the second time.
Not all of the gems here are required for RoR development, but I use cucumber for integration testing, and it has some pre-requisites.
# General/Pre-requisite packages
aptitude install \
build-essential \
screen \
subversion \
mysql-client \
telnet \
meld \
vim \
vim-gnome \
exuberant-ctags \
tk8.5 \
apache2-prefork-dev \
rcov
# mysql server
# use apt-get to avoid installing exim4
DEBIAN_FRONTEND=noninteractive apt-get install --assume-yes \
mysql-server mysql-client \
libmysqlclient15-dev libmysql-ruby1.8
# git
mkdir gitcore
cd gitcore
wget http://kernel.org/pub/software/scm/git/git-1.6.0.3.tar.gz
apt-get build-dep git-core --assume-yes
tar xzvf git-1.6.0.3.tar.gz
cd git-1.6.0.3/
./configure
make
make install
cd
# Ruby
aptitude --assume-yes install ruby1.8-dev ruby1.8 ri1.8 rdoc1.8 \
irb1.8 libreadline-ruby1.8 libruby1.8 libopenssl-ruby
ln -s /usr/bin/ruby1.8 /usr/local/bin/ruby;
ln -s /usr/bin/ri1.8 /usr/local/bin/ri;
ln -s /usr/bin/rdoc1.8 /usr/local/bin/rdoc;
ln -s /usr/bin/irb1.8 /usr/local/bin/irb;
ln -s /usr/local/bin/ruby /usr/bin/ruby
# Rubygems. You REALLY don't want to let aptitude install rubygems.
wget http://rubyforge.org/frs/download.php/45905/rubygems-1.3.1.tgz
tar xzf rubygems-1.3.1.tgz
cd rubygems-1.3.1
ruby setup.rb
ln -s /usr/bin/gem1.8 /usr/bin/gem
for g in rails rake capistrano capistrano-ext hpricot treetop ruby-debug term-ansicolor mongrel cheat passenger annotate-models rak; do gem install $g; done
Have fun.
David
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