Bundler: can't find gem bundler (>= 0.a) with executable bundle (Gem::GemNotFoundException) during bundle install with gem

Question

I'm executing the following script:

gem install rdoc --no-document gem install bundle bundle 

output:

+ gem install rdoc --no-document Successfully installed rdoc-6.1.1 1 gem installed + gem install bundle Successfully installed bundle-0.0.1 Parsing documentation for bundle-0.0.1 Done installing documentation for bundle after 2 seconds 1 gem installed 1 gem installed + bundle install /usr/lib/ruby/2.5.0/rubygems.rb:289:in `find_spec_for_exe': can't find gem bundler (>= 0.a) with executable bundle (Gem::GemNotFoundException)     from /usr/lib/ruby/2.5.0/rubygems.rb:308:in `activate_bin_path'     from /srv/myuser/.gem/ruby/2.5.0/bin/bundle:23:in `<main>' 

I've added /srv/myuser/.gem/ruby/2.5.0/bin to my path so I was able to install gems.

the gem env shows

RubyGems Environment:   - RUBYGEMS VERSION: 2.7.7   - RUBY VERSION: 2.5.1 (2018-03-29 patchlevel 57) [x86_64-linux]   - INSTALLATION DIRECTORY: /usr/lib/ruby/gems/2.5.0   - USER INSTALLATION DIRECTORY: /srv/myuser/.gem/ruby/2.5.0   - RUBY EXECUTABLE: /usr/bin/ruby   - EXECUTABLE DIRECTORY: /usr/bin   - SPEC CACHE DIRECTORY: /srv/myuser/.gem/specs   - SYSTEM CONFIGURATION DIRECTORY: /etc   - RUBYGEMS PLATFORMS:     - ruby     - x86_64-linux   - GEM PATHS:      - /usr/lib/ruby/gems/2.5.0      - /srv/myuser/.gem/ruby/2.5.0   - GEM CONFIGURATION:      - :update_sources => true      - :verbose => true      - :backtrace => false      - :bulk_threshold => 1000      - "gem" => "--user-install"   - REMOTE SOURCES:      - https://rubygems.org/   - SHELL PATH:      - /usr/local/sbin      - /usr/local/bin      - /usr/bin 

gem list shows the installed gems. I can also find bundle when I perform:

ls -ltrah /srv/myuser/.gem/ruby/2.5.0/bin 

I've also tried to install bundler but that didn't also help. What am I doing wrong?

gem which bundle is showing nothing.gem spec bundle is showing it.

Update: I tried to install bundler before running bundle but the same issue appears while:

gem list bundle shows

bundle (0.0.1) bundler (2.0.1) 

Answer 1

Bundler version 2 introduced a new feature to automatically use the version of Bundler specified in the Gemfile.lock of your project. Thus, if you have an existing Gemfile.lock with a line like this at the bottom

BUNDLED WITH    1.17.3 

Bundler will try to run with a Bundler version < 2.0. Since you just have Bundler 2.0.1 (and Rubygems >= 2.7.0) installed, this fails with this rather unhelpful error message.

To fix this, you could

• remove the lines from your Gemfile.lock and to use bundler 2.x everywhere from now on, or
• install a bundler 1.x version with gem install bundler -v '< 2.0' to use the appropriate version as specified by your Gemfile.lock.

More information about this can be found on the Bundler blog.