2. Once boot into Ubuntu, configure the network and install grub-customize by running following commands in terminal: sudo add-apt-repository ppa:danielrichter2007/grub-customizer sudo apt-get update sudo apt-get install grub-customizer Or directly download and install the deb from launchpad.net 3. Launch grub-customizer. In its Preference window second tab, check and change the resolution. Remember to click ‘Save‘ the configuration