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


** Attachment added: "This is the ruby-rvm.postinst after changing the group to 
sudo"
   
https://bugs.launchpad.net/ubuntu/+source/ruby-rvm/+bug/963662/+attachment/3127286/+files/ruby-rvm.postinst

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https://bugs.launchpad.net/bugs/963662

Title:
  package ruby-rvm 1.6.9-0hostname2 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 2

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