$ sudo mount /dev/cdrom /media/cdrom $ cd /media/cdrom $ sudo su # ./VBoxLinuxAdditions.run Verifying archive integrity... All good. Uncompressing VirtualBox 6.0.8 Guest Additions for Linux........ VirtualBox Guest Additions installer Removing installed version 6.0.8of VirtualBox Guest Additions... Copying additional installer modules ... Installing additional modules ... VirtualBox Guest Additions: Starting. VirtualBox Guest Additions: Building the VirtualBox Guest Additions kernel modules. This may take a while. VirtualBox Guest Additions: To build modules for other installed kernels, run VirtualBox Guest Additions: /sbin/rcvboxadd quicksetup <version> VirtualBox Guest Additions: or VirtualBox Guest Additions: /sbin/rcvboxadd quicksetup all VirtualBox Guest Additions: Building the modules for kernel 4.19.0-5-amd64. update-initramfs: Generating /boot/initrd.img-4.19.0-5-amd64 VirtualBox Guest Additions: Running kernel modules will not be replaced until the system is restarted