Very handy when a kernel update breaks the vboxguest module.
./VBoxLinuxAdditions.run --silent
VBoxWindowsAdditions.exe /S
If you need newer Guest Additions than your VirtualBox version (e.g., for a very recent Linux kernel), download the from Oracle’s public server: https://www.virtualbox.org/download/testcase/ Look for VBoxGuestAdditions_<version>.iso . But mixing major versions can break compatibility — test first. guest additions iso virtualbox