update ruby

[Thufir Hawat]

How do I update to ruby 1.9.1?

thufir at tleilax:~/Desktop/ruby/1$ 
thufir at tleilax:~/Desktop/ruby/1$ aptitude search ruby1.9.1-full
i   ruby1.9.1-full                                     - Ruby 1.9.1 full 
installation                                
thufir at tleilax:~/Desktop/ruby/1$ 
thufir at tleilax:~/Desktop/ruby/1$ ruby -v
ruby 1.8.7 (2010-06-23 patchlevel 299) [i686-linux]
thufir at tleilax:~/Desktop/ruby/1$ 
thufir at tleilax:~/Desktop/ruby/1$ sudo aptitude remove ruby1.8.7
Couldn't find any package whose name or description matched "ruby1.8.7"
Couldn't find any package whose name or description matched "ruby1.8.7"
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
                                         
thufir at tleilax:~/Desktop/ruby/1$ 
thufir at tleilax:~/Desktop/ruby/1$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=10.10
DISTRIB_CODENAME=maverick
DISTRIB_DESCRIPTION="Ubuntu 10.10"
thufir at tleilax:~/Desktop/ruby/1$ 


ruby1.9.1-full is installed, but not being used.  Why?




thanks,

Thufir