@Dale...I basically followed some of instruction Shawn posted above:

      sudo apt-get install build-essential
      sudo apt-get build-dep ruby-rvm
     apt-get source ruby-rvm

Then I followed the instruction from another post on this site using
this file:

https://bugs.launchpad.net/ubuntu/+source/ruby-
rvm/+bug/894311/+attachment/2843545/+files/0001-postinst-Ubuntu-has-
switched-from-admin-to-sudo-as-t.patch

*****
Hi,
I am a Linux noob but managed to solve this problem on a Ubuntu 12.04 64bit I 
found out where the rvm post inst file is located at:
/var/lib/dpkg/info/ruby-rvm.postinst
Opened it and replaced the admin group requirement to sudo:

The file contents are attached.
After changing it save it on your desktop and run the following command to copy 
the fixed file to the original location:

sudo cp ~/Desktop/ruby-rvm.postinst /var/lib/dpkg/info/ruby-rvm.postinst
*****

Everything worked fine at the end.

Hope this works for you.

Taiwo

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https://bugs.launchpad.net/bugs/894311

Title:
  ruby-rvm's maintainer scripts expect the admin group to exist

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