本文由macos教學專欄為大家介紹MacOS brew cask安裝VirtualBox遇到的問題，希望能夠幫助到有需要的小夥伴。
MacOS brew cask安裝VirtualBox遇到的問題
#問題一：Cask 'virtualbox' is already installed.
#如果不是透過Homebrew安裝的virtualbox，在使用brew cask install virtualbox安裝virtualbox的的時候，會提示：
Warning: Cask 'virtualbox' is already installed.
那麼就需要重新安裝virtualbox，指令：
brew cask reinstall virtualbox
如果還不巧，你的virtualbox剛好在運行中，又會提示：
Failed to unload org.virtualbox.kext.VBoxDrv - (libkern/kext) kext is in use or retained (cannot unload).
那麼，就需要網上拉日誌，找到：
Warning! Found the following active VirtualBox processes:
這些是運行中的虛擬主機列表，其中第一列是它們的ID，用kill指令關閉服務，如：
kill 234
然後再重新安裝：
brew cask reinstall virtualbox
問題二：Error: Failure while executing;
安裝virtualbox的最後一步會要求輸入電腦的登陸密碼，不過在你輸入密碼後，可能還是會提示錯誤，這是因為權限的問題，主要資訊如下：
~ brew cask reinstall virtualbox ==> Caveats To install and/or use virtualbox you may need to enable its kernel extension in: System Preferences → Security & Privacy → General ... ==> Running installer for virtualbox; your password may be necessary. ==> Package installers may write to any location; options such as --appdir are ignored. installer: Package name is Oracle VM VirtualBox installer: Installing at base path / installer: The install failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.) ==> Purging files for version 6.0.10,132072 of Cask virtualbox Error: Failure while executing; `/usr/bin/sudo -E -- env LOGNAME=gary USER=gary USERNAME=gary /usr/sbin/installer -pkg /usr/local/Caskroom/virtualbox/6.0.10,132072/VirtualBox.pkg -target /` exited with 1. Here's the output: installer: Package name is Oracle VM VirtualBox installer: Installing at base path / installer: The install failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.) Follow the instructions here: https://github.com/Homebrew/homebrew-cask#reporting-bugs /usr/local/Homebrew/Library/Homebrew/system_command.rb:111:in `assert_success' ...
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