Linguist: Bundler could not find compatible versions for gem "bundler"

[thzoid]

Preliminary Steps

Please confirm you have...

• [x] reviewed How Linguist Works,
• [x] reviewed the Troubleshooting docs,
• [x] considered implementing an override,
• [x] verified an issue has not already been logged for your issue (linguist issues).

Problem Description

I'm trying to follow the CONTIBUTING.md documentation but I'm stuck on some strange error.

Even if I run gem install bundler -v "~>1.10" (and Ruby installs Bundler 1.17.3), I get this error message when I try to do script/bootstrap:

Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
    bundler (~> 1.10)

  Current Bundler version:
    bundler (2.1.4)
This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running `gem install bundler`?

Could not find gem 'bundler (~> 1.10)' in any of the relevant sources:
  the local ruby installation

I'm using Ubuntu 20.04 LTS on Windows Subsystem for Linux (WSL).

I have tried:

• Reinstalling Ubuntu on WSL;
• Uninstalling Bundler 2.1.4 (no success, Ruby says it's a "default gem");
• Updating and upgrading packages;
• Changing the Bundler required version on Gemfile (which as I expected, brought lots of other problems).

I'm not very familiar with Linux, so, sorry if it's a dumb issue. What am I missing here?

[lildude]

This should do the trick:

• remove the Gemfile.lock file if it exists in the linguist directory
• install Bundler 1.17.3: gem install bundler -v 1.17.3
• run bundler _1.17.3_
• pick up the steps in CONTRIBUTING.md with script/bootstrap

[thzoid]

That worked at some level but then I got this error:

An error occurred while installing charlock_holmes (0.7.7), and Bundler cannot continue. Make sure that gem install charlock_holmes -v '0.7.7' --source 'https://rubygems.org/' succeeds before bundling.

I tried to run the suggested command: gem install charlock_holmes -v '0.7.7' --source 'https://rubygems.org/'

But then I got:

ERROR: Error installing charlock_holmes: ERROR: Failed to build gem native extension.

Ruby-dev and make are also installed and updated:
ruby-dev is already the newest version (1:2.7+1).
make is already the newest version (4.2.1-1.2).

It seems that g++ isn't installed. If I can get this to work, I'll give feedback. Thanks!

Edit: After installing g++ and charlock_holmes successfully, I was able to run script/bootstrap. Thanks again, @lildude!