How to Check if Virtualbox Guest Additions are Installed in a Linux Guest OS

By | May 1, 2023

Virtualbox guest additions allow better integration between the host and guest operating systems like seamless copy/paste, flexible screen resolution of the guest os etc.

After installing an OS inside VirtualBox you should install the Guest Additions right away to get the best features and functionality out of it.

It installs driver programs that enables native resolutions same as you current host OS, and also enables copy paste across the host and guest OS.

After installing the guest additions you can check if the guest additions are properly installed and active or not.

If your guest OS is a linux like Ubuntu or Fedora and you want to check if virtualbox guest additions are installed or not then you can use this simple command

$ lsmod | grep -i vbox

If the vbox modules are loaded they're installed and working. If nothing appears then probably virtualbox guest additions are not installed.

The output could be something like this for example

$ lsmod | grep -i vbox
vboxvideo              49152  0
drm_ttm_helper         16384  2 vmwgfx,vboxvideo
ttm                    94208  3 vmwgfx,vboxvideo,drm_ttm_helper
vboxguest             385024  5

or something like this on older systems:

$ lsmod | grep -i vbox
vboxvideo              12612  1 
drm                   264190  2 vboxvideo
vboxsf                 43659  0 
vboxguest             214867  7 vboxsf

If the output of the lsmod command does not show vbox modules, then either guest additions were not installed properly or they are not loaded. Then you might need to debug further.

Module Details

To check the module details we can use the modinfo command as follows:

$ modinfo vboxguest
filename:       /lib/modules/6.0.17-200.fc36.x86_64/misc/vboxguest.ko
version:        6.1.38 r153438
license:        GPL
description:    Oracle VM VirtualBox Guest Additions for Linux Module
author:         Oracle Corporation
srcversion:     FA5DE49C7F2CB39107D8436
alias:          pci:v000080EEd0000CAFEsv00000000sd00000000bc*sc*i*
retpoline:      Y
name:           vboxguest
vermagic:       6.0.17-200.fc36.x86_64 SMP preempt mod_unload 

The above output shows the exact module driver file name which in this case is /lib/modules/6.0.17-200.fc36.x86_64/misc/vboxguest.ko and other details like the version and vendor details.

About Silver Moon

A Tech Enthusiast, Blogger, Linux Fan and a Software Developer. Writes about Computer hardware, Linux and Open Source software and coding in Python, Php and Javascript. He can be reached at [email protected].

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