installing correct version of gem bundler for redmine install

Question

I'm trying to get redmine set up on my ubuntu 16.04 machine, and I'm working off this tutorial. I should also say that I tried to get redmine installed some months ago, ran into some passenger/phusion problems and put it aside. So, I started googling around and came across the linked tutorial.

I got to the install Passenger and NGINX step and got the following error:

Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
    rails (~> 4.2.5) was resolved to 4.2.6, which depends on
      bundler (< 2.0, >= 1.3.0)

  Current Bundler version:
    bundler (2.0.2)
This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running `gem install bundler`?

Could not find gem 'bundler (< 2.0, >= 1.3.0)', which is required by gem 'rails
(~> 4.2.5)', in any of the sources.

I then installed ver 1.17.1 going by an answer on this q. But I still had the same problem; when checking the bundler version I got this:

$ gem list bundler

*** LOCAL GEMS ***

bundler (default: 2.1.4, 1.17.1)
bundler-unload (1.0.2)
rubygems-bundler (1.4.5)

So I wanted to delete the new version as the default, and I found this q which instructed me to look in the gems/2.7.0/specifications/default/ dir. But when I look in that dir I do not see any of the expected gemspec files, I just see this:

~/.rvm/gems/ruby-2.7.0/specifications/default$ dir -lah
total 8.0K
drwxrwxr-x 2 jason jason 4.0K Jul 25 10:30 .
drwxrwxr-x 3 jason jason 4.0K Jul 25 10:30 ..

the contents of the parent dir are:

~/.rvm/gems/ruby-2.7.0/specifications$ ls -lh
total 16K
-rw-rw-r-- 1 jason jason 2.5K Jul 25 10:26 bundler-1.17.1.gemspec
drwxrwxr-x 2 jason jason 4.0K Jul 25 10:30 default
-rw-rw-r-- 1 jason jason 4.4K Jul 25 10:28 rubygems-update-   3.1.4.gemspec

As per the comment below, I determined the location of the default spec with

$ irb
2.7.0 :001 > Gem.default_specifications_dir
 => "/usr/share/rvm/rubies/ruby-  2.7.0/lib/ruby/gems/2.7.0/specifications/default" 
2.7.0 :002 > 

when switching to that dir, there are lots of gemspecs. Looking for bundlers, I found:

$ ls -al | grep bundler
-rw-rw-r-- 1 jason rvm 15100 Jul 25 10:30 bundler-2.1.4.gemspec

I moved that to the parent folder, logged out and back in and still got the orig error when running

sudo apt install -y nginx-extras passenger

Answer 1

The tutorial specifies Ruby 2.2.3 which is as-of-now currently unsupported, and it looks like you're using Ruby 2.7.0 and on older version of Rails. It also looks like Redmine is now on version 4 and this tutorial has you downloading the tarball of version 3.4.

Try following the Redmine installation instructions here and see if that works for you.

At any rate, if you do need to fix your Bundler versioning issues, open your project's Gemfile and change the Bundler version by entering gem 'bundler', '~> 1.17.1'

After running bundle install again, you can verify the Bundler version towards the bottom of the Gemfile.lock file:

BUNDLED WITH 1.17.1