From: Jon Lim <snowblink@...>
Date: 2006-06-20T20:00:46+09:00
Subject: Re: Installing irb in Ubuntu

IIRC that is was just poor naming on the meta packages.
Dapper does ship with ruby 1.8.4

$ sudo apt-get install irb ruby

will install the 1.8.4 versions

On 20/06/06, Pau Garcia i Quiles <pgquiles@elpauer.org> wrote:
> On Tuesday 20 June 2006 08:48, Minkoo Seo wrote:
>
> > Hi.
> >
> > I've installed Ubuntu Dapper in my desktop. To my disappoint it doesn't
> > have ruby preinstalled. That's still okay, because I can do it by myself.
> >
> > I've apt-get install ruby. Then, I've apt-get install irb1.8 because I've
> > installed
> > ruby1.8. Surprisingly, irb command did not work. It turned out that I also
> > have to apt-get install irb to run irb command.
> >
> > I can't figure out why things are working in this way. Does it make sense
> > to apt-get twice just for irb? Or is this my own problem and not of ubuntu
> > packages?
> >
> > If it's true that we have to apt-get install irb irb1.8 just for irb
> > command,
> > is there any way to fix such a non-intuitive installation procedure?
> >
> > Sincerely,
> > Minkoo Seo
>
> Actually, you got it completely wrong. Explanation and fix follows.
>
> If you run 'apt-cache show irb' and 'apt-cache show irb1.8' you'll see Ubuntu
> Dapper ships with two different Ruby versions: packages ruby, irb, ri, rdoc,
> etc are Ruby 1.8.2 and packages ruby1.8, irb1.8, ri1.8, rdoc1.8, etc are Ruby
> 1.8.4. I guess the reason to ship two different versions is some dependency
> problem, but I think that was a very wrong decision.
>
> Therefore, you now have two different irb versions installed: 1.8.2 and 1.8.4
> and I'm pretty sure you don't want that. I guess you want Ruby 1.8.4. What do
> you do?
> 1. First of all, remove the 1.8.2 versions (irb, ri, ruby, rdoc, etc). You may
> want to use dpkg --print-avail <packagename> to find out the version
> information for an already-installed package. You may want to use
> dpkg --get-selections to get a full list of packages installed on your
> computer.
>
> 2. Install the 1.8.4 versions (ruby1.8, irb1.8, rdoc1.8, etc). Now you'll
> have /usr/bin/ruby1.8, /usr/bin/irb1.8, etc
>
> 3. Use update-alternatives to install symlinks for easy access:
>
>    # update-alternatives --install /usr/bin/irb irb /usr/bin/irb1.8 10
>
>    This is a per-system (not per-user) setting. You might want to take a look
> at man update-alternatives to know the meaning of each option and how to
> reconfigure it later.
>
>   You can just create symlinks instead of using update-alternatives, but
> update-alternatives has some advantages (easy management, automanagement when
> you install a package that provides the the "alternative", etc).
>
> Debian Testing and Debian Sid have both Ruby 1.8.2 and Ruby 1.8.4, too.
>
> Lastly, some people have said it's impossible to install rails in Ubuntu.
> That's not true. There is a 'rails' package, it's up-to-date (1.1.2) and it's
> in the 'universe' repository. You may need to edit your /etc/apt/sources.list
> file.
>
> --
> Pau Garcia i Quiles
> http://www.elpauer.org
> (Due to the amount of work, I usually need 10 days to answer)
>
>
>


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