$ brew cask uninstall --force virtualbox
==> Running uninstall process for virtualbox; your password may be necessary
==> sudo: /opt/homebrew-cask/Caskroom/virtualbox/5.0.10-104061/VirtualBox_Uninstall.tool: command not found
Error: Command failed to execute!

==> Failed command:
["/usr/bin/sudo", "-E", "--", "#<Pathname:/opt/homebrew-cask/Caskroom/virtualbox/5.0.10-104061/VirtualBox_Uninstall.tool>", "--unattended"]

==> Output of failed command:


==> Exit status of failed command:
#<Process::Status: pid 23432 exit 1>

$ ls /opt/homebrew-cask/Caskroom/virtualbox/
4.3.20-96996 4.3.22-98236 4.3.26-98988 5.0.2-102096

$ brew cask list --verbose
atom         caffeine     gnubg         libreoffice  limechat    pgadmin3
spectacle    vagrant      virtualbox    wkhtmltopdf

$ brew cask doctor
==> OS X Release:
10.10
==> OS X Release with Patchlevel:
10.10.5
==> Hardware Architecture:
intel-64
==> Ruby Version:
2.0.0-p481
==> Ruby Path:
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
==> Homebrew Version:
0.9.5 (git revision 516e2; last commit 2015-11-13)
==> Homebrew Executable Path:
/usr/local/bin/brew
==> Homebrew Cellar Path:
/usr/local/Cellar
==> Homebrew Repository Path:
/usr/local
==> Homebrew Origin:
https://github.com/Homebrew/homebrew
==> Homebrew-cask Version:
0.59.0
==> Homebrew-cask Install Location:
/usr/local/Cellar/brew-cask/0.59.0
==> Homebrew-cask Staging Location:
/opt/homebrew-cask/Caskroom
==> Homebrew-cask Cached Downloads:
/Library/Caches/Homebrew
/Library/Caches/Homebrew/Casks
0 files
0.00 megs
==> Homebrew-cask Default Tap Path:
/usr/local/Library/Taps/caskroom/homebrew-cask
==> Homebrew-cask Alternate Cask Taps:
<NONE>
==> Homebrew-cask Default Tap Cask Count:
2857
==> Contents of $LOAD_PATH:
/usr/local/Cellar/brew-cask/0.59.0/rubylib
/Library/Ruby/Site/2.0.0
/Library/Ruby/Site/2.0.0/x86_64-darwin14
/Library/Ruby/Site/2.0.0/universal-darwin14
/Library/Ruby/Site
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0/x86_64-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby/2.0.0/universal-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/vendor_ruby
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/x86_64-darwin14
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin14
==> Contents of $RUBYLIB Environment Variable:
<NONE>
==> Contents of $RUBYOPT Environment Variable:
RUBYOPT=""
==> Contents of $RUBYPATH Environment Variable:
<NONE>
==> Contents of $RBENV_VERSION Environment Variable:
<NONE>
==> Contents of $CHRUBY_VERSION Environment Variable:
<NONE>
==> Contents of $GEM_HOME Environment Variable:
<NONE>
==> Contents of $GEM_PATH Environment Variable:
<NONE>
==> Contents of $BUNDLE_PATH Environment Variable:
<NONE>
==> Contents of $PATH Environment Variable:
PATH="/Users/bronson/.gem/ruby/2.2.2/bin:/Users/bronson/.rubies/ruby-2.2.2/lib/ruby/gems/2.2.0/bin:/Users/bronson/.rubies/ruby-2.2.2/bin:node_modules/.bin:/Users/bronson/node_modules/.bin:/Users/bronson/.nvm/v4.2.1/bin:/usr/local/bin:/usr/local/sbin:/Users/bronson/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/usr/local/mysql/bin:/usr/local/Library/ENV/scm"
==> Contents of $SHELL Environment Variable:
SHELL="/bin/bash"
==> Contents of Locale Environment Variables:
LANG="en_US.UTF-8"
==> Running As Privileged User:
No