Fix Virtualbox Guest Additions Installation Failed

# How to Install Virtualbox Guest Additions | Guest Install Failed
# Fix Windows 10 virtualbox guest additions failed
# Fix Copy Paste from Virtualbox to PC (vise-versa)
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Pastebin link http://mauwiks.com/virtualbox-guest (use in your Virtualbox server with GUI Browser to copy and paste code easily)

# Commands to update and install packages:
yum -y update
yum -y install epel-release
yum -y install wget nano screen curl zip unzip gcc make perl kernel-devel kernel-headers bzip2 dkms && yum -y update

# In the Virtualbox Menu > Insert Guest Additions CD Image

# In Terminal, mount the CD image commands
mount /dev/cdrom /mnt/

# Run installation scripts. First move to the mount point, then run the installation file
cd /mnt/
./VBoxLinuxAdditions.run

# Command to add user to vboxsf group:
usermod --append --groups vboxsf username

# Reboot VM to apply changes
reboot

# TROUBLESHOOTING 1:
/sbin/rcvboxadd quicksetup all
/sbin/rcvboxadd setup

# Goto VM settings > Storage and remove Attached CD/DVD

# Re-Insert VBox Guest Additions again

# Then re-install on Desktop: VBoxLinuxAdditions.run

# Reboot to apply chages
reboot