I'm using Redmine 2.4.3 on Ubuntu 14.04
Ruby 1.9.3
Fetching gem metadata from https://rubygems.org/............
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Using daemons 1.2.4
Using eventmachine 1.2.1
Using holidays 1.0.8
Using icalendar 2.4.1
Using json 2.0.3
Using nokogiri 1.5.11
Using open-uri-cached 0.0.5
Using pdf-core 0.2.5
Using ttfunk 1.2.2
Using prawn 1.2.1
Gem::InstallError: rack requires Ruby version >= 2.2.2.
An error occurred while installing rack (2.0.1), and Bundler cannot continue.
Make sure that gem install rack -v '2.0.1' succeeds before bundling.
I'm using Redmine 2.4.3 on Ubuntu 14.04 Ruby 1.9.3
Also the setup includes Apache2 and Passenger!