VirtualBox : Install GuestAdditions2020/08/05

	Install [GuestAdditions] into a Virtual Machine to improve Virtual Machine's System Performance. On the example below, it shows to install [GuestAdditions] on a Virtual Machine [Ubuntu_2004].
[1]	Attach [GuestAdditions]' disk to the VM on VirtualBox Host. The target VM must be stopped.

root@dlp:~#

apt -y install virtualbox-guest-additions-iso

root@dlp:~#

VBoxManage storageattach Ubuntu_2004 \
--storagectl Ubuntu_2004_SATA \
--port 0 \
--type dvddrive \
--medium /usr/share/virtualbox/VBoxGuestAdditions.iso

[2]	Start the VM and login to it, then Install [GuestAdditions] on it.

# install required packages first

root@guest:~#

LINUX_HEADERS=$(uname -r)

root@guest:~#

apt -y install gcc make bzip2 linux-headers-$LINUX_HEADERS

root@guest:~#

mount /dev/cdrom /mnt

root@guest:~#

cd /mnt

root@guest:/mnt#

./VBoxLinuxAdditions.run

Verifying archive integrity... All good.
Uncompressing VirtualBox 6.1.10 Guest Additions for Linux........
VirtualBox Guest Additions installer
Copying additional installer modules ...
Installing additional modules ...
VirtualBox Guest Additions: Building the VirtualBox Guest Additions kernel modules.  This may take a while.
update-initramfs: Generating /boot/initrd.img-5.4.0-26-generic
VirtualBox Guest Additions: Running kernel modules will not be replaced until the system is restarted
VirtualBox Guest Additions: Starting.

root@guest:/mnt#

reboot

After installing [GuestAdditions], System Performance will be improved.

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