Ruby on Rails

Alex Mercer wrote in post #1029306:
> Try to install dev lib for zlib:
> $ sudo apt-get -y install zlib zlib-devel

thank for answer..

i already try this command but nothing is working..

below is addition information of my problem when i try to install rail
using --debug command.i hope any expert can help me to solve this
problem..
your help is very appreciated.thank you very much.

oneadmin@oneadmin:/var/lib/gems/1.8$ sudo gem install rails --debug
Exception `NameError' at
/usr/lib/ruby/1.8/rubygems/command_manager.rb:161 - uninitialized
constant Gem::Commands::InstallCommand
Exception `Gem::LoadError' at /usr/lib/ruby/1.8/rubygems.rb:827 - Could
not find RubyGem test-unit (>= 0)

Exception `Gem::LoadError' at /usr/lib/ruby/1.8/rubygems.rb:827 - Could
not find RubyGem sources (> 0.0.1)

Exception `EOFError' at /usr/lib/ruby/1.8/net/protocol.rb:135 - end of
file reached
Exception `Zlib::DataError' at /usr/lib/ruby/1.8/rubygems.rb:599 -
incorrect header check
ERROR: While executing gem ... (Zlib::DataError)
incorrect header check
/usr/lib/ruby/1.8/rubygems.rb:599:in `inflate'
/usr/lib/ruby/1.8/rubygems.rb:599:in `inflate'
/usr/lib/ruby/1.8/rubygems/spec_fetcher.rb:100:in `fetch_spec'
/usr/lib/ruby/1.8/rubygems/spec_fetcher.rb:72:in `fetch'
/usr/lib/ruby/1.8/rubygems/spec_fetcher.rb:71:in `map'
/usr/lib/ruby/1.8/rubygems/spec_fetcher.rb:71:in `fetch'
/usr/lib/ruby/1.8/rubygems/dependency_installer.rb:99:in
`find_gems_with_sources'
/usr/lib/ruby/1.8/rubygems/dependency_installer.rb:192:in
`find_spec_by_name_and_version'
/usr/lib/ruby/1.8/rubygems/dependency_installer.rb:213:in
`install'
/usr/lib/ruby/1.8/rubygems/commands/install_command.rb:118:in
`execute'
/usr/lib/ruby/1.8/rubygems/commands/install_command.rb:115:in
`each'
/usr/lib/ruby/1.8/rubygems/commands/install_command.rb:115:in
`execute'
/usr/lib/ruby/1.8/rubygems/command.rb:257:in `invoke'
/usr/lib/ruby/1.8/rubygems/command_manager.rb:132:in
`process_args'
/usr/lib/ruby/1.8/rubygems/command_manager.rb:102:in `run'
/usr/lib/ruby/1.8/rubygems/gem_runner.rb:58:in `run'
/usr/bin/gem:21

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