Less Is More
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Install VirtualBox Guest Additions
On Debian
# apt-get install dkms
# mount /dev/cdrom /media/cdrom
# /media/cdrom/VBoxLinuxAdditions.run
# umount /media/cdrom
On CentOS
# yum install gcc kernel-devel kernel-headers bzip2
# mkdir /media/cdrom
# mount /dev/cdrom /media/cdrom
# /media/cdrom/VBoxLinuxAdditions.run
# umount /media/cdrom