mount /dev/cdrom /media cd /media ./VBoxLinuxAdditions.run
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# ./VBoxLinuxAdditions.run Verifying archive integrity... All good. Uncompressing VirtualBox 5.1.10 Guest Additions for Linux........... VirtualBox Guest Additions installer Removing installed version 5.1.10 of VirtualBox Guest Additions... Copying additional installer modules ... Installing additional modules ... vboxadd.sh: Building Guest Additions kernel modules. vboxadd.sh: You should restart your guest to make sure the new modules are actually used. vboxadd.sh: Starting the VirtualBox Guest Additions.
Could not find the X.Org or XFree86 Window System, skipping