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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