How to solve a RubyMine "'ruby-debug-ide' isn't installed" error

Here's the actual command that worked for me:

gem install ruby-debug-ide --pre

I started getting this after upgrading from 2017.x to 2018.1. In my case, it seems that RubyMine needed a newer version but its error message implied it couldn't find any version and failed to install it. I think it was trying to install it with a different SDK.

Manually installing the latest ruby-debugger-ide (in my case the --pre flag was necessary) and then restarting RubyMine did the trick for me.

Since you're using Mac OSX, I couldn't provide the same exact answer for you, but you can find a similar way of achieving this. I'm using Ubuntu with Vagrant, so you may need to adapt it just a little bit.

1. Copy the following gem from RubyMine/rb/gems app folder, please copy the gem related to your ruby runtime and platform, there are different gems for different ruby runtime and platforms, in my case, its:
   • debase-0.3.0.beta7.gem
   • ruby-debug-ide-0.8.0.beta6.gem
2. Install them inside your app host, in my case its vagrant, in your case it could be inside your container, or in your host OS using the following command:

gem install --force --local *.gem

3. Set breakpoint and start debugging.

It may asks you one more time to install the gem, but then the debug will works for sure.

This worked for me

gem install debase-ruby_core_source

Source: Cannot install Rubymine Debugger

I had this issue on Windows 11 running Ubuntu on WSL2. To solve, I manually copied the relevant files in my %AppData% directory into the corresponding directory in Ubuntu.

I found all the data at: C:\Users[USER]\AppData\Local\JetBrains\RubyMine[VERSION]\ruby_stubs\[NUMBER]\home\[USER]\.gem\ruby\2.7.0

These files were copied to: \\wsl.localhost\Ubuntu\home\[USER]\.gem\ruby\2.7.0

After doing this, everything worked again.

Check ruby SDK's version is right.You can first using rails installer to install everything .

Then using gem to install rdebug for ruby 2+.

Make sure Rubymine's Ruby version is same to which you have installed.With those all done,you will be able to debug ruby.

Please check x286 vs 64 version, both Ruby and Rmine version. I had this problem runnin x86 rubyMine on 64 ruby

A combination of matching the host ide ruby version with the remote SDK version worked for me but required a few additional steps. I too am running mac os as my host (running mohave)

1. the remote environment setup in preferences -> ruby sdk and gems must have the same version as the remote target, including any gems installed.

NOTE: I had to re-install the bundler gem on both host and remote host to get the gem manager to install things auto-majically.

2. the project environment must be changed to use the same version as the remote host as well. this is in File -> preferences for new projects -> ruby sdk and gems.

NOTE: I also had to set the default RVM on my local host and remote host and unset the previous version as default in the local host preferences.

Once I did this I was able to get gems in sync and remote debugger to connect.

Running Ubuntu 18 something, RubyMine version 2020.3. Had this issue. None of these suggestions worked for me, same error no matter what did. I was using RVM, and ruby 2.6 and 2.7, switched back and forth a cleaning and reinstalling gems along thew way, both debase and ruby-debug-ide were installed according to the gem list. Settings in rubymine matched "ruby -v" from the command line. VSCode worked perfectly with this setup.

In the end i removed RVM and all the ruby versions, installed ruby via rbenv, installed ruby 2.6.5 and that worked like a charm.

I think this error is generated for multiple reasons with no real way to figure out which reason for your specific instance. I would like to encourage jetbrains to generate more debug information on errors like this, or if you are generating error information, point out where it is when this happens.

Try these steps:

1. /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
2. brew install ruby
3. echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.bash_profile

if you get unshallow error on any step then first try:

1. git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core fetch --unshallow
2. git -C /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask fetch --unshallow
3. /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
4. brew install ruby
5. echo 'export PATH="/usr/local/opt/ruby/bin:$PATH"' >> ~/.bash_profile

Lastly restart the terminal and check .bash_profile:

 - nano ~/.bash_profile

If you see the path variable, just close it. Otherwise it means something went wrong :/.

The last step is to open

RubyMine -> Preferences -> Language and Frameworks -> Ruby SDK and Gems -> select the newest ruby version and apply.

You may need to update ruby version from the gemfile.

And it should be done!