Thanks for your report.
These are the correct source package.
~$ apt-cache show ruby-elisp ruby1.8-elisp ruby1.9-elisp|grep Source
Source: ruby-defaults
Source: ruby1.8
Source: ruby1.9
Don't hesitate to submit any new bug.
** Changed in: ubuntu
Status: New => Invalid
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Bad sources in ruby-elisp, ruby1.8-elisp and ruby1.9-elisp
https://bugs.launchpad.net/bugs/159687
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