install ruby1.9.1

[Clint Byrum]

On Fri, 2011-01-21 at 10:24 -0600, Peng Yu wrote:
> Hi,
> 
> I installed ruby1.9.1. But there is not a symbolic link from ruby to
> ruby1.9.1 (the executable). I'm wondering if ubuntu deliberately not
> to make a link from ruby to ruby1.9.1?
> 

Ubuntu is following Debian on this one.

Its believed that the two languages (ruby 1.8 and ruby 1.9) are too
different from one another to be managed by the alternatives system.

Your best bet is probably to use rvm.