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https://bratunets.wordpress.com/2017/04/13/%d1%83%d1%81%d1%82%d0%b0%d0%bd%d0%be%d0%b2%d0%ba%d0%b0-virtualbox-linux-guest-additions-%d0%bd%d0%b0-%d0%b2%d0%b8%d1%80%d1%82%d1%83%d0%b0%d0%bb%d1%8c%d0%bd%d1%83%d1%8e-%d0%bc%d0%b0%d1%88%d0%b8%d0%bd-2/
Установка VirtualBox Linux Guest Additions на виртуальную машину с CentOS 6.9