Install VBox Guest

Before run the commands below, please Insert Guest Addition CD Image CD...

Open Terminal and run the following commands.

Install VBox Guest Addition

# Update the packages index and install the dependencies of VBox Guest Addition
sudo apt update
sudo apt install gcc make
# Instal VBox Guest Addtion
cd /media/dev/VBox_GAs_6.1.26/
sudo ./autorun.sh

Add $USER to the vboxsf group.
```
sudo adduser $USER vboxsf
```
Reboot the system
```
# Reboot the system
sudo reboot now
```

After finish installing, please remove the Guest Addition CD Image