No ruby alternatives on 11.04 / 11.10?
Well you need more than 1 version of ruby installed for there to possibly be an alternative to "ruby" (generally /usr/bin/ruby
If you only have ruby1.9.1 installed, (ruby1.9.X), then there is no alt. available
Ex. here on 11.10, - for some media apps I need both 1.9.2 & 1.8 installed so update-alternatives reflects that & allows me to switch as needed
$ sudo update-alternatives --config ruby
[sudo] password for doug:
There are 2 choices for the alternative ruby (providing /usr/bin/ruby).
Selection Path Priority Status
------------------------------------------------------------
0 /usr/bin/ruby1.8 50 auto mode
1 /usr/bin/ruby1.8 50 manual mode
* 2 /usr/bin/ruby1.9.1 10 manual mode
Press enter to keep the current choice[*], or type selection number:
By default in 11.04/11.10 the package "ruby" provides ruby1.8