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While trying to execute the Wiki-Lyrics script, you probably stumbled on the following error message:

We are sorry...
You need QtRuby, RubyGTK or TkRuby to execute this program.

To solve this problem, we'll need to install the libgtk2-ruby package, executing the following command in a terminal:

sudo apt-get install libgtk2-ruby

Perhaps you've received a warning like this once, executing the command sudo apt-get update:

Reading package lists... Done
W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ...
W: You may want to run apt-get update to correct these problems

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