/home/ian # gem update --system                                                                             root@iris
Updating rubygems-update
Fetching: rubygems-update-2.0.3.gem (100%)
Successfully installed rubygems-update-2.0.3
Installing RubyGems 2.0.3
RubyGems 2.0.3 installed
unable to convert U+00E1 from UTF-8 to US-ASCII for lib/rubygems/package.rb, skipping
unable to convert U+201C from UTF-8 to US-ASCII for lib/rubygems/specification.rb, skipping
unable to convert U+00E1 from UTF-8 to US-ASCII for lib/rubygems/package/tar_header.rb, skipping
unable to convert U+00E1 from UTF-8 to US-ASCII for lib/rubygems/package/tar_writer.rb, skipping
unable to convert U+00E1 from UTF-8 to US-ASCII for lib/rubygems/package/tar_reader/entry.rb, skipping
unable to convert U+00E1 from UTF-8 to US-ASCII for lib/rubygems/package/tar_reader.rb, skipping
Installing ri documentation for rubygems-2.0.3

ERROR:  While executing gem ... (ArgumentError)
    invalid byte sequence in US-ASCII