After the installation of Ubuntu, when I try to boot a black screen with a purple box appears without let me see the GRUB menu. Then the screen becomes black and Ubuntu starts booting. Ubuntu is the only OS installed, but it's quite annoying as I can't see the bootloader options. What could be wrong?
When Ubuntu is the only installed OS, the GRUB menu is automatically hidden as per default. To change this, edit your GRUB configuration using the following command:
sudo nano /etc/default/grub
Then you have to replace the following line:
with this one:
To learn more about the options in /etc/default/grub, run the following command to browse the GRUB info page:
info -f grub -n 'Simple configuration'