$ sudo apt-cache search ruby

#这个结果很长，我只截取最后与ruby有关的部分

ruby1. - Interpreter of object-oriented scripting language Ruby 1.8

ruby1.-dev - Header files for compiling extension modules for the Ruby 1.8

ruby1.-examples - Examples for Ruby 1.8

rubygems - package management framework for Ruby libraries/applications

rubygems1. - Transitional package for rubygems

rubygems-doc - Transitional package for rubygems

ruby1.9.1-full - Ruby 1.9. full installation

ruby1.-full - Ruby 1.8 full installation

ruby-switch - switch between different Ruby interpreters

ruby2. - Interpreter of object-oriented scripting language Ruby

libruby2. - Libraries necessary to run Ruby 2.1

ruby2.-dev - Header files for compiling extension modules for the Ruby 2.1

ruby2.-tcltk - Ruby/Tk for Ruby 2.1

ruby2.-doc - Documentation for Ruby 2.1

ruby2. - Interpreter of object-oriented scripting language Ruby

libruby2. - Libraries necessary to run Ruby 2.2

ruby2.-dev - Header files for compiling extension modules for the Ruby 2.2

ruby2.-tcltk - Ruby/Tk for Ruby 2.2

ruby2.-doc - Documentation for Ruby 2.2

ruby2. - Interpreter of object-oriented scripting language Ruby

ruby2.-doc - Documentation for Ruby 2.3

libruby2. - Libraries necessary to run Ruby 2.3

ruby2.-dev - Header files for compiling extension modules for the Ruby 2.3

ruby2.-tcltk - Ruby/Tk for Ruby 2.3

libruby2. - Libraries necessary to run Ruby 2.4

ruby2.-dev - Header files for compiling extension modules for the Ruby 2.4

ruby2. - Interpreter of object-oriented scripting language Ruby

ruby2.-doc - Documentation for Ruby 2.4

sudo apt-get install ruby #自动安装最新版本
sudo apt-get install ruby2.0 

$ sudo apt-get install software-properties-common

$ sudo apt-add-repository ppa:brightbox/ruby-ng

$ sudo apt-get update
$ sudo apt-get install ruby1.9.3 ruby1.9.3-dev

$ curl -L get.rvm.io | bash -s stable

$ source ~/.bashrc

$ source ~/.bash_profile

$ source ~/.profile

$ rvm -v

$ rvm list known

$ rvm install 2.2

$ ruby -v

ruby 2.2.6p396 (-- revision ) [x86_64-linux]

如果想在Ubuntu上安装多个Ruby版本，那么可以使用下面的命令来指定使用rvm作为默认的Ruby版本管理。

rvm use ruby 1.9. --default
rvm use ruby 1.9.3-p551  --default #制定子版本

$ rvm list known

Warning, new version of rvm available '1.29.2', you are using older version '1.29.1'.

You can disable this warning with:    echo rvm_autoupdate_flag= >> ~/.rvmrc

You can enable  auto-update  with:    echo rvm_autoupdate_flag= >> ~/.rvmrc

# MRI Rubies

[ruby-]1.8.[-p420]

[ruby-]1.8.[-head] # security released on head

[ruby-]1.9.[-p431]

[ruby-]1.9.[-p330]

[ruby-]1.9.[-p551]

[ruby-]2.0.[-p648]

[ruby-]2.1[.]

[ruby-]2.2[.]

[ruby-]2.3[.]

[ruby-]2.4[.]

ruby-head

# for forks use: rvm install ruby-head-<name> --url https://github.com/github/ruby.git --branch 2.2

# JRuby

jruby-1.6[.]

jruby-1.7[.]

jruby[-9.1.7.0]

jruby-head

# Rubinius

rbx-[.4.3]

rbx-2.3[.]

rbx-2.4[.]

rbx-[.5.8]

rbx[-3.71]

rbx-head

# Opal

opal

# Minimalistic ruby implementation - ISO :

mruby-1.0.

mruby-1.1.

mruby-[.2.0]

mruby[-head]

# Ruby Enterprise Edition

ree-1.8.

ree[-1.8.][-2012.02]

# Topaz

topaz

# MagLev

maglev[-head]

maglev-1.0.

# Mac OS X Snow Leopard Or Newer

macruby-0.10

macruby-0.11

macruby[-0.12]

macruby-nightly

macruby-head

# IronRuby

ironruby[-1.1.]

ironruby-head

结果参考