How to install Rails application on ubuntu?

While installing, some errors are displayed. The command I am using is:

sudo gem install rails --include-dependencies

or

sudo gem install rails --no-rdoc --no-ri

In both cases, it is the same error. I think my rubygems may not be installed properly?

ERROR: Loading command: install (LoadError) no such file to load -- zlib ERROR: While executing gem ... (NameError) uni开发者_JS百科nitialized constant Gem::Commands::InstallCommand

I have installed ruby-1.9.2-p0 and rubygems-1.3.7

One more thing: Do I have to cd into the ruby or rubygems directory and then install rails or can I do it from default directory?

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Open command prompt and please let us know the results

verify Ruby version

ruby -v

verify gem version

gem -v

Use command

gem install rails

verify the rails version

rails -v

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$ sudo apt-get install ruby1.9 gem1.9

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checkout below mentioned link that would help you to install rails3 using rvm on ubuntu box http://www.jaikeerthi.in/2010/11/install-rails-ubuntu/

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You have to install zlib1g and zlib1g-dev

sudo aptitude install zlib1g zlib1g-dev

Some GEMs compile some binaries at installation time and need other libraries (such as zlib) be installed on the system.

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Assuming that you are installing on Ubuntu 14.04...

First install rbev to pick a Ruby version for your application.

sudo apt-get update

Install the rbenv and Ruby dependencies with apt-get:

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

Now let's install rbenv

 cd

git clone git://github.com/sstephenson/rbenv.git .rbenv

echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile

echo 'eval "$(rbenv init -)"' >> ~/.bash_profile

git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bash_profile

source ~/.bash_profile

And now let's install Ruby:

rbenv install -v 2.2.3
rbenv global 2.2.3

Verify that Ruby is installed with this command:

ruby -v

Install bundler to manage gems:

gem install bundler

Now we are set to install Rails:

gem install rails

Then run

rbenv rehash

It's good to verify if the Rails is installed properly:

rails -v

Make sure to install database and Javascript runtime afterwards...