When trying to install this plugin on Vagrant 1.9.3, it fails.
Environment Info
OS: Ubuntu 16.04
Vagrant: 1.9.3 installed via deb file
Error message
$ vagrant plugin install vagrant-vcloud
Installing the 'vagrant-vcloud' plugin. This can take a few minutes...
/opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/specification.rb:2100:in `check_version_conflict': can't activate httpclient-2.3.4.1, already activated httpclient-2.8.3 (Gem::LoadError)
from /opt/vagrant/embedded/lib/ruby/2.2.0/rubygems/specification.rb:1276:in `activate'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/bundler.rb:357:in `block in activate_solution'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/bundler.rb:354:in `each'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/bundler.rb:354:in `activate_solution'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/bundler.rb:279:in `internal_install'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/bundler.rb:104:in `install'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/plugin/manager.rb:62:in `block in install_plugin'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/plugin/manager.rb:72:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/plugin/manager.rb:72:in `install_plugin'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/commands/plugin/action/install_gem.rb:29:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builder.rb:116:in `call'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `block in run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/util/busy.rb:19:in `busy'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `run'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/commands/plugin/command/base.rb:14:in `action'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/commands/plugin/command/install.rb:32:in `block in execute'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/commands/plugin/command/install.rb:31:in `each'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/commands/plugin/command/install.rb:31:in `execute'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/commands/plugin/command/root.rb:66:in `execute'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/cli.rb:42:in `execute'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/environment.rb:308:in `cli'
from /opt/vagrant/embedded/gems/gems/vagrant-1.9.3/bin/vagrant:127:in `<main>'
Summary
When trying to install this plugin on Vagrant 1.9.3, it fails.
Environment Info
Error message
Possible Solutions