MacOS brew cask安装VirtualBox遇到的问题

问题一:Cask 'virtualbox' is already installed.

如果不是通过Homebrew安装的virtualbox,在使用brew cask install virtualbox安装virtualbox的的时候,会提示:

Warning: Cask 'virtualbox' is already installed.

那么就需要重新安装virtualbox,命令:

brew cask reinstall virtualbox

如果还不巧,你的virtualbox刚好在运行中,又会提示:

Failed to unload org.virtualbox.kext.VBoxDrv - (libkern/kext) kext is in use or retained (cannot unload).

那么,就需要网上拉日志,找到:

Warning! Found the following active VirtualBox processes:

这些是运行中的虚拟主机列表,其中第一列是它们的 ID,用kill命令关闭服务,如:

kill 234

然后再重新安装:

brew cask reinstall virtualbox

问题二:Error: Failure while executing;

安装virtualbox的最后一步会要求输入电脑的登陆密码,不过在你输入密码后,可能还是会提示错误,这是因为权限的问题,主要信息如下:

~ 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'
...

这主要是因为安装源被block了,电脑打开:System PreferencesSecurity & PrivacyGeneral,然后点右下方的“Allow”允许,再重新安装。

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