title: Gem update: unable to convert "\xE7" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII
body: <p>just ran <code>gem update</code> on a light use server machine that hadn't been updated in a while... and am getting loads of 'unable to convert "\x??" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for..." errors. Included is an except from console. anyone know what's going on?</p>
  
  <pre><code>$ sudo gem update
  Installing ri documentation for railties-3.0.4...
  Installing ri documentation for minitest-2.0.2...
  Installing ri documentation for net-ssh-2.1.0...
  unable to convert "\xE7" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for lib/net/ssh/authentication/pageant.rb, skipping
  unable to convert "\xC3" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for lib/net/ssh/buffered_io.rb, skipping
  unable to convert "\xC3" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for lib/net/ssh/service/forward.rb, skipping
  unable to convert "\xC3" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for THANKS.rdoc, skipping
  unable to convert "\xC3" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for CHANGELOG.rdoc, skipping
  Installing ri documentation for rails-3.0.4...
  file 'lib' not found
  Installing ri documentation for rails3-generators-0.17.4...
  unable to convert "\xC3" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for README.rdoc, skipping
  Installing ri documentation for rdoc-3.5.3...
  unable to convert U+201D from UTF-8 to US-ASCII for lib/rdoc/text.rb, skipping
  unable to convert "\xC3" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for History.txt, skipping
  Installing ri documentation for rspec-core-2.5.1...
  unable to convert "\xC2" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for lib/rspec/core/subject.rb, skipping
  Installing ri documentation for rspec-expectations-2.5.0...
  unable to convert "\xC2" to UTF-8 in conversion from ASCII-8BIT to UTF-8 to US-ASCII for lib/rspec/matchers.rb, skipping
  Installing ri documentation for rspec-mocks-2.5.0...
  Installing ri documentation for rspec-2.5.0...
  Installing ri documentation for rspec-rails-2.5.0...
  </code></pre>