Error installing vagrant. Y U trying to uninstall?

gistfile1.txt

$ sudo vagrant plugin install vagrant-triggers
Installing the 'vagrant-triggers' plugin. This can take a few minutes...
Installed the plugin 'vagrant-triggers (0.4.3)'!
Uninstalling the 'vagrant-triggers' plugin...
Uninstalling the 'vagrant-triggers' plugin...
Uninstalling the 'vagrant-triggers' plugin...
/usr/lib/ruby/2.1.0/rubygems/uninstaller.rb:118:in `uninstall': vagrant-triggers is not installed in GEM_HOME, try: (Gem::InstallError)
	gem uninstall -i /home/fabio/.vagrant.d/gems vagrant-triggers
	from /usr/share/vagrant/plugins/commands/plugin/action/prune_gems.rb:148:in `block (2 levels) in call'
	from /usr/lib/ruby/2.1.0/set.rb:263:in `each_key'
	from /usr/lib/ruby/2.1.0/set.rb:263:in `each'
	from /usr/share/vagrant/plugins/commands/plugin/action/prune_gems.rb:138:in `block in call'
	from /usr/share/vagrant/plugins/commands/plugin/gem_helper.rb:42:in `block in with_environment'
	from /usr/lib/ruby/2.1.0/rubygems/user_interaction.rb:45:in `use_ui'
	from /usr/share/vagrant/plugins/commands/plugin/gem_helper.rb:41:in `with_environment'
	from /usr/share/vagrant/plugins/commands/plugin/action/prune_gems.rb:133:in `call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
	from /usr/share/vagrant/plugins/commands/plugin/action/uninstall_plugin.rb:18:in `call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
	from /usr/share/vagrant/plugins/commands/plugin/action/bundler_check.rb:20:in `call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:34:in `call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/builder.rb:116:in `call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:69:in `block in run'
	from /usr/lib/ruby/vendor_ruby/vagrant/util/busy.rb:19:in `busy'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:69:in `run'
	from /usr/share/vagrant/plugins/commands/plugin/action/install_gem.rb:116:in `recover'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:67:in `block in recover'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:64:in `each'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:64:in `recover'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:53:in `rescue in call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/warden.rb:28:in `call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/builder.rb:116:in `call'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:69:in `block in run'
	from /usr/lib/ruby/vendor_ruby/vagrant/util/busy.rb:19:in `busy'
	from /usr/lib/ruby/vendor_ruby/vagrant/action/runner.rb:69:in `run'
	from /usr/share/vagrant/plugins/commands/plugin/command/base.rb:17:in `action'
	from /usr/share/vagrant/plugins/commands/plugin/command/install.rb:27:in `execute'
	from /usr/share/vagrant/plugins/commands/plugin/command/root.rb:56:in `execute'
	from /usr/lib/ruby/vendor_ruby/vagrant/cli.rb:38:in `execute'
	from /usr/lib/ruby/vendor_ruby/vagrant/environment.rb:484:in `cli'
	from /usr/bin/vagrant:127:in `<main>'

rm -rf /home/fabio/.vagrant.d/gems and reinstalling the thing solved this issue.