Failed to stop vboxadd-x11.service: Unit vboxadd-x11.service not loaded. Failed to stop vboxvfs.service: Unit vboxvfs.service not loaded. Failed to stop vboxadd-timesync.service: Unit vboxadd-timesync.service not loaded. vboxadd.sh: failed: Configuration file /var/lib/VBoxGuestAdditions/config not found. vboxadd.sh: failed: Look at /var/log/vboxadd-install.log to find out what went wrong. vboxadd.sh: failed: Look at /var/log/vboxadd-install.log to find out what went wrong. vboxadd.sh: failed: modprobe vboxguest failed.