Yaml.rb:133: BUG Segmentation fault

/usr/lib/ruby/1.8/yaml.rb:133: [BUG] Segmentation fault

This means that your server does not have enough memory (RAM) for installation (GEM) to work.

Increase RAM on your server or change server.

This often happens on cheap VPS (Virtual Private Servers).

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Use top command to check it. If you have something like:

Mem:    131072k total,   131072k used,        0k free,        0k buffers
Swap:        0k total,        0k used,        0k free,        0k cached

That means real trouble.