我试图设置一个Ubuntu 14.04实例来托管我正在开发的rails 4.2应用程序，但无论安装了多少ruby / rails，我都会遇到同样的错误。我使用的是ruby 2.2.0和rails 4.2.0
当我尝试运行任何初始化rails的命令时，我得到以下异常：
undefined method `default_timezone=' for ActiveRecord::Base:Class
使用通过brightbox/ruby-ng apt存储库安装的ruby，以及通过rbenv和ruby-build安装时会发生这种情况。对于我的OS X 10.10.2计算机上安装的相同版本的ruby / rails，应用程序没有出现此错误。
运行$ bin/rake db:migrate --trace：
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
NoMethodError: undefined method `default_timezone=' for ActiveRecord::Base:Class
/var/lib/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/dynamic_matchers.rb:26:in `method_missing'
/var/lib/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/railtie.rb:71:in `block (2 levels) in <class:Railtie>'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:27:in `each'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
/var/lib/gems/2.2.0/gems/activerecord-4.2.0/lib/active_record/railtie.rb:69:in `block in <class:Railtie>'
/var/lib/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec'
/var/lib/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run'
/var/lib/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers'
/usr/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each'
/usr/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
/usr/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from'
/usr/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component'
/usr/lib/ruby/2.2.0/tsort.rb:345:in `each'
/usr/lib/ruby/2.2.0/tsort.rb:345:in `call'
/usr/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component'
/usr/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each'
/usr/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each'
/var/lib/gems/2.2.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers'
/var/lib/gems/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!'
[redacted project dir]/config/environment.rb:5:in `<top (required)>'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
/var/lib/gems/2.2.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
/var/lib/gems/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:328:in `require_environment!'
/var/lib/gems/2.2.0/gems/railties-4.2.0/lib/rails/application.rb:443:in `block in run_tasks_blocks'
/usr/lib/ruby/2.2.0/rake/task.rb:240:in `call'
/usr/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute'
/usr/lib/ruby/2.2.0/rake/task.rb:235:in `each'
/usr/lib/ruby/2.2.0/rake/task.rb:235:in `execute'
/usr/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/usr/lib/ruby/2.2.0/rake/task.rb:201:in `block in invoke_prerequisites'
/usr/lib/ruby/2.2.0/rake/task.rb:199:in `each'
/usr/lib/ruby/2.2.0/rake/task.rb:199:in `invoke_prerequisites'
/usr/lib/ruby/2.2.0/rake/task.rb:178:in `block in invoke_with_call_chain'
/usr/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/usr/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain'
/usr/lib/ruby/2.2.0/rake/task.rb:165:in `invoke'
/usr/lib/ruby/2.2.0/rake/application.rb:150:in `invoke_task'
/usr/lib/ruby/2.2.0/rake/application.rb:106:in `block (2 levels) in top_level'
/usr/lib/ruby/2.2.0/rake/application.rb:106:in `each'
/usr/lib/ruby/2.2.0/rake/application.rb:106:in `block in top_level'
/usr/lib/ruby/2.2.0/rake/application.rb:115:in `run_with_threads'
/usr/lib/ruby/2.2.0/rake/application.rb:100:in `top_level'
/usr/lib/ruby/2.2.0/rake/application.rb:78:in `block in run'
/usr/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling'
/usr/lib/ruby/2.2.0/rake/application.rb:75:in `run'
bin/rake:4:in `<main>'
Tasks: TOP => db:migrate => environment
我尝试在config.time_zone文件中设置config.active_record.default_timezone和config/application.rb，但都没有帮助。
有没有人有任何建议来解决这个问题？