Using rvm to run both versions of Ruby

First - install the latest version of git

$ sudo apt-get install git

Next run the following

$ bash < <(curl -s

Next go to the following user

$ cd .rvm/bin


$ ./rvm reload


$ sudo ./rvm package install zlib


$ sudo ./rvm install 1.8.7


$ sudo ./rvm install 1.9.2

Next create your gemsets for each install

$  ./rvm --create 1.8.7@187location

$ ./rvm --create 1.9.2@192location

Set the default to use ruby 1.9.2

$ sudo ./rvm --default use 1.9.2@192location

$ ruby -v

ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux]