這裡說的是通過apt-get安裝ruby，自己編譯的情況就免了。
首先，在安裝ruby本身時一定要把ruby和ruby-dev全安裝了。現在的版本是1.8，因此應該執行如下命令
[code]
sudo apt-get install ruby1.8 ruby1.8-dev rubygems
[/code]
這是因為許多plugin或者gems都要依賴dev下面的東東，比如ferret就要用到乙個叫mkmf的東西，後者就是包含在dev中的。
然後可以gem或者apt-get來安裝rails，不過推薦前者，因為版本肯定是最新的。比如我用的源裡面的rails還不是1.2的呢，用apt-get就不好了。
最後就是找找這些東東都安裝在哪兒了，可以在根目錄下執行find命令
[code]
sudo find -iname *ruby* >> result.txt
[/code]
下面是我電腦上的執行結果
[code]
./usr/share/doc/ruby
./usr/share/doc/ruby/ruby-policy.sgml.gz
./usr/share/doc/ruby/ruby-policy.txt.gz
./usr/share/doc/ruby/ruby-policy.html
./usr/share/doc/ruby/ruby-policy.html/ch-ruby.html
./usr/share/doc/ruby/ruby-policy.html/ap-ruby1.8_bundled_modules.html
./usr/share/doc/rubygems
./usr/share/doc/libreadline-ruby1.8
./usr/share/doc/ruby1.8-dev
./usr/share/doc/libruby1.8
./usr/share/doc/ruby1.8
./usr/share/doc/libopenssl-ruby1.8
./usr/share/doc/libgems-ruby1.8
./usr/share/doc/libgems-ruby1.8/test/data/legacy/keyedlist-0.4.0.ruby
./usr/share/gedit-2/plugins/snippets/ruby.xml
./usr/share/gtksourceview-1.0/language-specs/ruby.lang
./usr/share/man/man1/ruby1.8.1.gz
./usr/share/man/man1/ruby.1.gz
./usr/share/nano/ruby.nanorc
./usr/bin/update_rubygems
./usr/bin/ruby
./usr/bin/ruby1.8
./usr/lib/libruby1.8-static.a
./usr/lib/ruby
./usr/lib/ruby/gems/1.8/doc/rubygems-0.9.4
./usr/lib/ruby/gems/1.8/doc/rubygems-0.9.4/ri/gem/specification/to_ruby-i.yaml
./usr/lib/ruby/gems/1.8/doc/rubygems-0.9.4/ri/gem/commands/updatecommand/do_rubygems_update-i.yaml
./usr/lib/ruby/gems/1.8/doc/rubygems-0.9.4/ri/gem/ruby-c.yaml
./usr/lib/ruby/gems/1.8/doc/rubygems-0.9.4/rdoc/files/lib/rubygems_rb.html
./usr/lib/ruby/gems/1.8/doc/rubygems-0.9.4/rdoc/files/lib/rubygems
./usr/lib/ruby/gems/1.8/doc/rubygems-0.9.4/rdoc/files/lib/rubygems/rubygems_version_rb.html
./usr/lib/ruby/gems/1.8/doc/actionwebservice-1.2.3/ri/actionwebservice/protocol/soap/soapmarshaler/ruby_to_soap-i.yaml
./usr/lib/ruby/gems/1.8/doc/actionwebservice-1.2.3/ri/actionwebservice/protocol/soap/soapmarshaler/soap_to_ruby-i.yaml
./usr/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake/ruby182_test_unit_fix.rb
./usr/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake/contrib/rubyforgepublisher.rb
./usr/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/ruby_version_check.rb
./usr/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/rubyprof_ext.rb
./usr/lib/ruby/1.8/rubygems
./usr/lib/ruby/1.8/rubygems/rubygems_version.rb
./usr/lib/ruby/1.8/rubygems.rb
./usr/lib/ruby/1.8/yaml/rubytypes.rb
./usr/lib/ruby/1.8/wsdl/xmlschema/xsd2ruby.rb
./usr/lib/ruby/1.8/wsdl/soap/wsdl2ruby.rb
./usr/lib/ruby/1.8/irb/ruby-token.rb
./usr/lib/ruby/1.8/irb/ruby-lex.rb
./usr/lib/ruby/1.8/i486-linux/rubyio.h
./usr/lib/ruby/1.8/i486-linux/rubysig.h
./usr/lib/ruby/1.8/i486-linux/ruby.h
./usr/lib/ruby/1.8/rubyunit.rb
./usr/lib/libruby1.8.so.1.8.5
./usr/lib/libruby1.8.so
./usr/lib/libruby1.8.so.1.8
./usr/local/lib/site_ruby
./usr/local/lib/site_ruby/1.8/rubygems
./usr/local/lib/site_ruby/1.8/rubygems/rubygems_version.rb
./usr/local/lib/site_ruby/1.8/rubygems.rb
[/code]
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