Problem installing RoR Ubuntu 9.04

Dear friends, I installed RoR using the "Agile Web Development with Rails, 3rd edition" recipe in my Ubuntu 9.04. Apparently all has been installed well, but when I try to create a new application (page 35) using the command "rails demo", I get the message "The program 'rails' is currently not installed. You can install it by typing: sudo apt-get install rails. bash: rails: command not found." It seems that Ubuntu not find Rails... and I typed the command "export PATH=/var/lib/gems/1.8/bin:$PATH. Sorry, I am RoR and Ubuntu novice. Thank you in advance!!



Follow this tutorial.

Thanks & Regards, Dhruva Sagar.

I use this script to install the lamp stack, mysql ruby and rails (on ubuntu 9.10, not sure if any diffs on 9.04). It assumes that there is a folder ~/downloads. Don't just copy and paste it, you have to work out where the lines have been folded by the mailer

# this installs the lamp stack, the ^ is important. See sudo apt-get install lamp-server^ sudo apt-get install libapache2-mod-auth-mysql phpmyadmin

# this derived from # bits for building stuff cd ~ sudo apt-get install build-essential # ruby and mysql stuff, this assumes that the lamp stack with mysql has already been installed sudo apt-get install ruby ri rdoc libmysql-ruby ruby1.8-dev irb1.8 libdbd-mysql-perl libdbi-perl libmysql-ruby1.8 libmysqlclient15off libnet-daemon-perl libplrpc-perl libreadline-ruby1.8 libruby1.8 rdoc1.8 ri1.8 ruby1.8 irb libopenssl-ruby libopenssl-ruby1.8 libhtml-template-perl wget -N -P ~/downloads tar xvzf ~/downloads/rubygems-1.3.5.tgz cd rubygems-1.3.5 sudo ruby setup.rb cd .. rm -rf rubygems-1.3.5 echo "making symlinks - not sure if this will always be necessary, must be done if gem -v does not work" sudo ln -s /usr/bin/gem1.8 /usr/local/bin/gem sudo ln -s /usr/bin/ruby1.8 /usr/local/bin/ruby sudo ln -s /usr/bin/rdoc1.8 /usr/local/bin/rdoc sudo ln -s /usr/bin/ri1.8 /usr/local/bin/ri sudo ln -s /usr/bin/irb1.8 /usr/local/bin/irb # rails latest version sudo gem install rails


Are you sure the rails executable file is in that path? Did you try /var/lib/gems/1.8/bin/rails first? Try not to rely on "magic" solutions but to understand what's really happening. If the error says that "rails" is not a program, make sure that it is installed first, then make sure it is in your path.

Hope it helps. Cheers.

Hi Luiz, I think the problem is that when you use Synaptic/aptitude to install rubygems, rails (v2.2 available from the repo) needs to be installed the same way. I would suggest you follow Colin’s reply and try installing rubygems from source. Prior to that, libyaml-ruby and libzlib-ruby need to be installed from Synaptic. Once installed, ‘gem1.8’ will be in /usr/bin. Rename it to ‘gem’ and you are good to ‘gem install rails’.

regards, Ashwin

I'm sorry to disagree with this approach, but I think it has a few drawbacks. The best way I've found to install RoR environment on a Debian-like distro is to install rubygems form apt-get/aptitude, then install every gem with the gem command, this will be nicer with gems update, since debian-like distros are pretty conservatives for package updates and, generally, gems releases will be faster that the distros releases.

One more thing, renaming gem1.8 to gem will break the distro's policies, I'd recommend you to add an alias or to set up /etc/alternatives (I'm not a Debian-like user, so I cannot tell you how to do this, but you should google that)


OK but... I forgot to ask... before any try to solve my problem, I think I have to uninstall RoR and then reinstall. How to do that? I found something but as I'm a novice, it's difficult to choose a path. Thank you for all that gently replied!

Usually when you export the path it should work. Check again that the path corresponds to the gems path where you have the Rails gem. You can use this command:

gem env

to gather more info about the gem environment and you should be able to see the GEM_PATH, so check if in that path you have the Rails gem. It is a boring problem but it is usually a path issue.

Have you installed another version of Ruby? Reply with you gem env output to get more help.

Hi, Luiz!

I had the same problem as you. Namely, I struggled with installing RoR development environment on my Ubuntu box. I found a nice and EASY solution: use BitNami RubyStack, which is available at Ruby Cloud Hosting, Ruby Installer, Docker Container and VM. Everything is included, and it works out of the box. I highly recommend it.

It has a very clear user guide as well, at Ruby packaged by Bitnami.



OK, this is the result: gem env - RUBYGEMS VERSION: 1.3.1 - RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [i486-linux] - INSTALLATION DIRECTORY: /var/lib/gems/1.8 - RUBY EXECUTABLE: /usr/bin/ruby1.8 - EXECUTABLE DIRECTORY: /var/lib/gems/1.8/bin - GEMS PATHS:        - /var/lib/gems/1.8        - /home/luiz/.gem/ruby/1.8

Hmmmm, thank you. But I saw that BitNami install Mysql and PHP. Well, I thought to use Firebird but it is more probable that I will use Postgre and RoR. Is it possible?

Hi friends! My problem has gone! With a little shame because it's so easy... :-). I received a tip to put "PATH=/var/lib/gems/1.8/bin:$PATH" in my file .profile with gedit. And all goes well! Thank you to everybody!

Oh yes, it possible to use Postgresql with the BitNami package. But the downside is that you still end up having MySQL around. :-/ First you install the BitNami Rubystack with MySQL, then you use Postgresql add-on.