$ sudo add-apt-repository "deb http://archive.canonical.com/ lucid partner" $ sudo apt-get update $ sudo apt-get install sun-java6-jdk $ sudo update-alternatives --all C言語系 (gcc) [#d82ecdba] $ sudo apt-get install build-essential ruby [#o957f9cb] $ sudo apt-get install ruby irb $ sudo apt-get install ruby-elisp