Installing Ruby 1.9.1 on Ubuntu

Installing Ruby 1.9.1 on Ubuntu?

Save yourself the headache and use RVM (Ruby Version Manager)

Keep in mind, Rails 3 works best with Ruby 1.9.2. Ruby 1.9.2 fixes up quite a few bugs in 1.9.1 and is preferable to running 1.9.1.

With RVM installing 1.9.2 is a breeze.

How do I install Ruby 1.9.3 on Ubuntu without RVM?

1st approach

Source

http://lenni.info/blog/2012/05/installing-ruby-1-9-3-on-ubuntu-12-04-precise-pengolin/

The new Ubuntu release has just rolled around and with it a slew of new packages. Personally, I'm tracking the development of Ruby quite closely but the default Ruby on Ubuntu ist still the 1.8 series which I can't recommend. Ruby 1.9 has some performance improvements and 1.9.3 in particular a lot of them compared to 1.9.2.

However, as I have elaborated in a previous post getting the Ruby 1.9 series on Ubuntu without using RVM instead of 1.8 isn't all that easy. Please read the post if you are interested in the details.

The short version is: You can get Ruby 1.9.3-p0 by installing the ruby-1.9.1 package. (The package is called 1.9.1 because that is the ABI version.)

If you want to make Ruby 1.9 the default do the following:

sudo apt-get update

sudo apt-get install ruby1.9.1 ruby1.9.1-dev \

 rubygems1.9.1 irb1.9.1 ri1.9.1 rdoc1.9.1 \ build-essential libopenssl-ruby1.9.1 libssl-dev zlib1g-dev

sudo update-alternatives --install /usr/bin/ruby ruby /usr/bin/ruby1.9.1 400 \
     --slave   /usr/share/man/man1/ruby.1.gz ruby.1.gz \
                /usr/share/man/man1/ruby1.9.1.1.gz \
     --slave   /usr/bin/ri ri /usr/bin/ri1.9.1 \
    --slave   /usr/bin/irb irb /usr/bin/irb1.9.1 \
    --slave   /usr/bin/rdoc rdoc /usr/bin/rdoc1.9.1

# choose your interpreter
# changes symlinks for /usr/bin/ruby , /usr/bin/gem
# /usr/bin/irb, /usr/bin/ri and man (1) ruby

 sudo update-alternatives --config ruby
 sudo update-alternatives --config gem

# now try
 ruby --version

If you want to make this your exclusive Ruby and get rid of Ruby 1.8 follow the uninstallation instructions.

Edit: I found out today that there also is a package called ruby1.9.3 however that is just a proxy package that doesn't have any files itself and only depends on ruby1.9.1. Aptitude confirms this:

Ruby uses two parallel versioning schemes: the `Ruby library compatibility version' (1.9.1 for this package), which is similar to a library SONAME, and the 'Ruby version' (1.9.3 for this package). Ruby packages in Debian are named using the Ruby library compatibility version, which is sometimes confusing for users who do not follow Ruby development closely. This package depends on the ruby1.9.1 package, and provides compatibility symbolic links from 1.9.3 executables and manual pages to their 1.9.1 counterparts.

There doesn't seem to be a rubygems1.9.3.

2nd approach

Also This link i found useful its very simple and effective.

http://ryanbigg.com/2010/12/ubuntu-ruby-rvm-rails-and-you/

How do I install the latest version of ruby in Ubuntu?

I use Ubuntu, and I've found the easiest way to install newer versions of Ruby is to use rvm.

The instructions are here: https://rvm.io/rvm/install/

Basically, it installs different versions of Ruby locally for the user and updates environment variables for Ruby and gems based on which version you decide to use.

It's this easy:

jim@schubert:~$ rvm use system
Now using system ruby.
jim@schubert:~$ ruby -v
ruby 1.8.7 (2010-08-16 patchlevel 302) [x86_64-linux]
jim@schubert:~$ gem -v
1.3.7
jim@schubert:~$ rvm use 1.9.2
Using /home/jim/.rvm/gems/ruby-1.9.2-p180
jim@schubert:~$ ruby -v
ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux]
jim@schubert:~$ gem -v
1.5.2
jim@schubert:~$ 

Ruby 1.9.1 isn't recognized on Ubuntu

After the install was complete, I got the following error(s):

Those aren't errors. They're warnings issued by rubygems. If you want to avoid them run rubygems with sudo or add add /home/brooks/.gem/ruby/1.9.1/bin to your PATH variable. Or if you don't care that you can't run executables installed by gems without specifying the whole path, just ignore them.

When I run "ruby -v" (without the quotes) I get the following response:

bash: /usr/bin/ruby: No such file or directory

Try ruby1.9.1 -v

gssapi requires Ruby version = 1.9.1. on gem install

The package is called 1.9.1 because that is the ABI version.

Ruby uses two parallel versioning schemes: the `Ruby library
compatibility version' (1.9.1 for this package), which is similar to a
library SONAME, and the 'Ruby version' (1.9.3 for this package). Ruby
packages in Debian are named using the Ruby library compatibility
version, which is sometimes confusing for users who do not follow Ruby
development closely. This package depends on the ruby1.9.1 package,
and provides compatibility symbolic links from 1.9.3 executables and
manual pages to their 1.9.1 counterparts.

Installed Ruby 1.9.3 with RVM but command line doesn't show ruby -v

You have broken version of RVM. Ubuntu does something to RVM that produces lots of errors, the only safe way of fixing for now is to:

sudo apt-get --purge remove ruby-rvm
sudo rm -rf /usr/share/ruby-rvm /etc/rvmrc /etc/profile.d/rvm.sh

open new terminal and validate environment is clean from old RVM settings (should be no output):

env | grep rvm

if there was output, try to open new terminal, if it does not help then restart your computer.

install RVM:

\curl -L https://get.rvm.io | 
  bash -s stable --ruby --autolibs=enable --auto-dotfiles

If you find you need some hand-holding, take a look at Installing Ruby on Ubuntu 12.04, which gives a bit more explanation.

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