How to Install Ruby 2 on Ubuntu Without Rvm

How to install Ruby 2 on Ubuntu without RVM

sudo apt-get -y update
sudo apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
wget http://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p451.tar.gz
tar -xvzf ruby-2.0.0-p451.tar.gz
cd ruby-2.0.0-p451/
./configure --prefix=/usr/local
make
sudo make install

from here How do I install ruby 2.0.0 correctly on Ubuntu 12.04?

UPDATE

for ruby 2.1.5

sudo apt-get -y update
sudo apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
wget http://ftp.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz 
tar -xvzf ruby-2.1.5.tar.gz
cd ruby-2.1.5/
./configure --prefix=/usr/local
make
sudo make install

if you are still seeing an older ruby check your symlink
ls -la /usr/bin/ruby from hector

How do I install ruby 2.0.0 correctly on Ubuntu 12.04?

follow below steps

sudo apt-get -y update
sudo apt-get -y install build-essential zlib1g-dev libssl-dev libreadline6-dev libyaml-dev
cd /tmp
wget http://cache.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p481.tar.gz
tar -xvzf ruby-2.0.0-p481.tar.gz
cd ruby-2.0.0-p481/
./configure --prefix=/usr/local
make
sudo make install

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 to install Ruby 2.1.4 on Ubuntu 14.04

First of all, install the prerequisite libraries:

sudo apt-get update
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev

Then install rbenv, which is used to install Ruby:

cd
git clone https://github.com/rbenv/rbenv.git ~/.rbenv
echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc
echo 'eval "$(rbenv init -)"' >> ~/.bashrc
exec $SHELL

git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build
echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
exec $SHELL

rbenv install 2.3.1
rbenv global 2.3.1
ruby -v

Then (optional) tell Rubygems to not install local documentation:

echo "gem: --no-ri --no-rdoc" > ~/.gemrc

Credits: https://gorails.com/setup/ubuntu/14.10

Warning!!!
There are issues with Gnome-Shell. See comment below.

upgrade ruby version without rvm

This is just an example of how to resolve this issue. The paths and file names might be different on your system, but you should get the idea from here:

# First locate the original ruby
> which ruby
/usr/bin/ruby   # <- Your path might be different

# Then locate ruby19
> which ruby19
/usr/bin/ruby19

# Move the old ruby out of the way
> mv /usr/bin/ruby /usr/bin/ruby_old

# Link ruby to the new ruby (ruby19)
# ln -s is used to create a new symbolic link. See "man ln" for more info.
> cd /usr/bin
> ln -s ruby19 ruby

Now you should have:

/usr/bin/ruby_old                 # The old executable
/usr/bin/ruby -> /usr/bin/ruby19  # The new link
/usr/bin/ruby19                   # The new executable

Note: it's easy to break your system ruby if you're not careful using this method. That's why RVM is usually a better solution if you have the choice. You can leave a comment if something breaks, and I will try and improve the instructions.

installed ruby using apt-get install ruby 2.0.0 succeeded but not using correct ruby version

If you're new to linux I'd recommend using something like RVM (Ruby Version Manager) to install ruby. It makes it easier to switch ruby versions and manage multiple gemsets.

To install RVM with the latest (stable) ruby:

\curl -L https://get.rvm.io | bash -s stable --ruby

then check which rubies are installed by using

rvm list

you can then switch ruby versions using

rvm use 2.0.0 --default

with the --default flag overriding any system ruby.

Update

If you really don't want to use RVM, then use

sudo apt-get install checkinstall

wget -c http://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p0.tar.gz
tar -xzf ruby-2.0.0-p0.tar.gz
cd ruby-2.0.0-p0

./configure   
make

sudo checkinstall -y \
  --pkgversion 2.0.0-p0 \
  --provides "ruby-interpreter"

checkinstall will package the source, making it easier to remove in the future

You'll then need to add the Ruby binaries to your path, by editing the env file:

sudo nano /etc/environment

add /usr/local/ruby/bin

PATH="/usr/local/ruby/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

then run

source /etc/environment

to reload the file, and check your ruby version with

ruby -v

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