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
If holding 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.
GRUB_TIMEOUT=10

This will wait for 10 seconds before booting the default operating system.
Also read the grub rescue tips for better understanding of GRUB bootloader.
¸I HAVE a problem GRUB on win7 i have ssd... no such device:0dd91720-fbe2-4df4-9d98-0bd0c3101bd7.
what i must do? i have important file on disk.
First recover the important files by booting a Linux live USB.
And check this guide to fix the no such device issue. https://www.pcsuggest.com/grub-error-no-such-device/