如何从Ubuntu 14.04中完全卸载ruby + gems + rails，然后开始以全新的方式安装它们

Question

I am having a lot of issues on ruby & gem installation due to which my running projects are stopped working.

Current issues

Can anyone please guide me on "how to completely uninstall ruby + gems + rails out of my Ubuntu 14.04 and then start installing them as fresh".

I am also unable to remove this. Maybe once I completely throughout of my system. It may allow me to fresh install ruby n rails. Looking into this in order to make things work again.

Can anyone help?

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If you can see my question up there, I have rbenv, ruby and rails installed and a lot more. I am not able to run it though. And due to which I am thinking of removing it out of my system and install them as fresh. Today, I somehow was able to fix a few issues and created a new rails application and started the server using MySQL. But, its too showing errors on other ruby lib command: rails script/generate model Book Rails is throwing me errors.

 /home/<user>/.rvm/gems/ruby-2.5.3/gems/railties-5.2.1/lib/rails/app_loader.rb:53: warning: Insecure world writable dir /home/<user>/.rvm/gems/ruby-2.5.3/bin in PATH, mode 040777
rails aborted!
Don't know how to build task 'script/generate' (see --tasks)

Can anyone help?

Answer 1

I highly highly recommend not touching the built-in ruby/rails/gems installation.

It's pretty standard these days to use a very lightweight manager, like rbenv which allows you to work with multiple versions of ruby, each with it's own installations of gems. There is also rvm , which is a heavier manager and a bit more invasive.

Answer 2

install the newer versions with rbenv

• brew install rbenv
• rbenv init
• Close your Terminal window and open a new one so your changes take effect.
• Verify that rbenv is properly set up using this rbenv-doctor script.
• rbenv install.

• brew upgrade rbenv ruby-build

  and then install rails
  ruby on rails setup

  for database i preferred sqlite browser