On Jan 1, 2008, at 22:16 PM, Lobo tuerto Cazador wrote:
> I'm new to Ruby and Linux, I was happily doing some examples and
> exploring this wonderful language, when I decided to upgrade to  
> RubyGems
> 1.0.1.
>
> After that (and I think it was after that, not really sure), all the
> gems I had installed where gone.
>
> Issuing this command showed an empty list:
> "gem list" or "sudo gem list"
>
>
> But I was sure I had rails, mongrel, sqlite3, rake and other gems
> installed. So I did a "find / -name "mongrel*.*" and found them in:
> /var/lib/gems/1.8/gems

If you installed RubyGems first using an apt package (apt's RubyGems  
installs gems into /var/lib), then upgraded RubyGems with gem update -- 
system, these kinds of things may happen.  There is a warning note in  
the release announcement about this.