On the guest Linux system, ensure the build environment is ready:
The "VirtualBox Guest Additions unable to load VBoxGuest kernel module" issue can occur due to various reasons:
Remove any existing installation:
In the Linux guest terminal:
Mount the ISO and run sudo ./VBoxLinuxAdditions.run . For Fedora, RHEL, or Rocky Linux How do I install Guest Additions in a VirtualBox VM? On the guest Linux system, ensure the build
"VirtualBox Guest Additions: unable to load vboxguest kernel module"
If nothing appears, the module is not loaded. When you see "unable to load vboxguest kernel
When you see "unable to load vboxguest kernel module" , the Linux kernel cannot insert the vboxguest.ko module into the running kernel. This breaks virtually all Guest Additions functionality.
sudo setenforce 0 sudo modprobe vboxguest sudo setenforce 1 On the guest Linux system
/etc/systemd/system/vboxguest-reload.service :
Look for active (running) and no error messages.