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I’m on Ubuntu. I type in sudo gem install rails. This works fine, installs railes and 7 other gems fine. Yet $ rails blog is saying this:
The program 'rails' is currently not installed. You can install it by typing:
sudo apt-get install rails
how did you install rubygems, as an admin, or as a user? if you installed it as a user, it may not have the bin directory in your path.
If I were you, (assuming you installed rubygems into your home folder), I would trash that installation dir (not sure where it defaults to, maybe ~/rubygems? or ~/.rubygems?), then run setup.rb from the rubygems tarball as admin (through sudo) I’ve done this at least a dozen times on ubuntu, and haven’t run into the issue you are hitting.
If that isn’t the case, could you please link to the blog post you were following?