This is what I'm stuck on, I'm fairly new to ruby/gems, and have no idea what to do

/usr/local/lib/site_ruby/1.8/rubygems.rb:149:in `activate': can't activate data_objects (= 0.9.6, runtime), already activated data_objects-0.9.7 (Gem::Exception)

I'm trying to set up a Ruby/Merb 1.0/Datamapper on my Ubuntu 8.10 Slice.
I keep trying over and over, I have probably re-wiped my slice at least 20 times now.
Anyway, this is the code I have, from all that I have gathered all over the internet.
And I still can't get it to work. If anyone could be kind enough to proof read this for me and tell me, what I'm missing, and what I can cut out of there would be helpful too.

Thanks,

Serhiy

apt-get update
apt-get upgrade

apt-get install ruby irb ri rdoc ruby1.8-dev libzlib-ruby libyaml-ruby libreadline-ruby libncurses-ruby libcurses-ruby libruby libruby-extras libfcgi-ruby1.8 build-essential libopenssl-ruby libdbm-ruby libdbi-ruby libdbd-sqlite3-ruby sqlite3 libsqlite3-dev libsqlite3-ruby libxml-ruby libxml2-dev

gem install erubis rake json_pure rspec rack hpricot mime-types addressable english rspec

apt-get install bash man-db cron wget lynx git-core subversion build-essential

###Need RuybGems 1.3 for Merb, Ubuntu Installs 1.2 Need to compile it myself
apt-get install ruby ruby1.8-dev
wget http://rubyforge.org/frs/download.php/45905/rubygems-1.3.1.tgz
tar zxvf rubygems-1.3.1.tgz
cd rubygems-1.3.1
ruby setup.rb
###Not certian if required but some forum says so
ln -s /usr/bin/gem1.8 /usr/bin/gem

#From merb site
sudo gem install rake rack thor rspec mongrel hoe diff-lcs
sudo gem install dm-core dm-more
sudo gem install merb

apt-get install mysql-server
apt-get install mysql-client
apt-get install libmysqlclient15-dev libmysql-ruby1.8

CREATE DATABASE test_development; CREATE DATABASE test_test; CREATE DATABASE test_production;

merb-gen app test

merb