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When you upgrade from old Ubuntu to new Ubuntu. Your GRUB menu will contain more than one Ubuntu. To remove unwanted Ubuntu from GRUB you need to edit the GRUB configuration file. Follow these steps. Backup your GRUB configuration file which is in /boot/grub/grub.cfg which we will need if something goes wrong. Open Terminal (Applications - Accessories - Terminal). You need to be the root. For that : sudo -i Now we want to edit the file....