Here in this quick tip, I'll show you how to enter the GRUB boot menu while only one operating system, i.e. Ubuntu installed on the system.
- First Shut down your Laptop/Desktop.
- Next power it up again.
- Press and hold the Shift key soon after you see the UEFI /BIOS is screen.
- You should be able to access the the GRUB menu.
Alternative method to enter GRUB menu
Shift key doesn’t work, then you need to edit the
/etc/default/grub file, and find the line
GRUB_TIMEOUT and edit it to below.
This will wait for 10 seconds before booting the default operating system.
Also read the grub rescue tips for better understanding of GRUB bootloader.