The Case of the Vanishing Clipboard: Debugging a VirtualBox Guest Additions Conflict on Kali Linux

A Kali Linux VM in VirtualBox stopped sharing clipboard due to a VirtualBox Guest Additions conflict. The issue was caused by a kernel module stuck 'in use' and a systemd service failing on every boot. To fix, reinstall VirtualBox Guest Additions and ensure the vboxguest kernel module is unloaded before rebooting. This requires manually unloading the module and updating the initramfs to prevent it from loading again on boot. The fix also involves restarting the VBoxService and VBoxClient services. This issue highlights the importance of understanding the moving parts involved in clipboard sharing and the need to manually manage kernel modules and services.