I&#39;ve just moved over to Ubuntu 8.10 as my dev box; it&#39;s my first serious foray into Linux as a daily-use OS, and I&#39;m having a hard time getting Rails going.  I have followed a number of tutorials which all seem to work fine, but when I try and use gem install or gem update on anything, I get an error that looks like this:

    /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require&#39;: no such file to load -- zlib (LoadError)
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/spec_fetcher.rb:1
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/commands/update_command.rb:5
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:167:in `load_and_instantiate&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:88:in `[]&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:144:in `find_command&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:131:in `process_args&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/command_manager.rb:102:in `run&#39;
	from /usr/local/lib/ruby/site_ruby/1.8/rubygems/gem_runner.rb:58:in `run&#39;
	from /usr/local/bin/gem:21

I have (as recommended in the tutorials) installed zlib, zlib1g, and zlib1g-dev.  I&#39;ve even found a few tutorials on this particular problem (all for flavors other than mine, however) but they didn&#39;t help.

I&#39;m on Ubuntu 8.10, ruby version  1.8.8dev gem version 1.3.2

I&#39;ve tried reinstalling ruby and gems each and separately, to no avail.



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Ubuntu rails install fails on zlib