From: Eric Hodel <drbrain@...7.net>
Date: 2008-06-26T06:34:56+09:00
Subject: Re: RubyGems 1.2.0

On Jun 24, 2008, at 12:25 PM, Roger Pack wrote:
>> == How can I get RubyGems?
>>
>> NOTE:  If you have installed RubyGems using a package system you  
>> may want to
>> install a new RubyGems through the same packaging system.
>
> It appears I am destined for poor luck with this upgrade.
> Tried it in a fresh ubuntu install
>
> sudo apt-get install ruby rubygems
> # worked
>
>
> sudo gem update --system
> # said it worked
>
>
> Now I get the infamous
> /usr/bin/gem:23: uninitialized constant Gem::GemRunner (NameError)

You either ignored the NOTE in the release notes, or did not read the  
end of the update output.  For my /usr/local/bin/ruby18 it prints:

> RubyGems installed the following executables:
> 	/usr/local/bin/gem18
>
> If `gem` was installed by a previous RubyGems installation, you may  
> need
> to remove it by hand.

It probably said something similar that you ignored (like RubyGems  
installing /usr/bin/gem1.8)