Craig White wrote in post #1029937:

>
> If you installed rubygems it would seem impossible for the command
> update_rubygems not to be found. Perhaps it is not installed.
>
> Perhaps someone is familiar with Ubuntu's ruby packages and can guide
> you with what it is that isn't working right. Generally, the
> distribution packages lag too far behind and seem to be an obstruction
> which is one of the reasons why things like rvm have become popular.
>
> I suppose the way to install it would be...
> sudo apt-get install rubygems
>
> On my ubuntu 10.04 LTS (but not using any Ubuntu ruby packages
> whatsoever because I use the enterprise ruby packages)
>
> If rubygems package is installed, you should be able to easily run 'sudo
> update rubygems'
>
> Craig
>
>
> --
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i think i already install rubygem below is my command to verify that 
rubygem is install in my system.i also try to use apt-get install 
rubygem but the system show that my rubygem is already new version.below 
all the output:-

root@oneadmin:~# apt-get install rubygems
Reading package lists... Done
Building dependency tree
Reading state information... Done
rubygems is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.

root@oneadmin:~# dpkg --get-selections | grep rubygems
rubygems                                        install
rubygems1.8                                     install

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