Change which linux install "controls" grub
You'll have to reinstall the xubuntu-grub on the Master Boot Record of your hard drive. Just type sudo grub-install /dev/sda from ubuntu and ubuntu will be back in control.
You'll have to reinstall the xubuntu-grub on the Master Boot Record of your hard drive. Just type sudo grub-install /dev/sda from ubuntu and ubuntu will be back in control.