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Solution:
- Turn on laptop and boot into Ubuntu OS.
- Launch the command Terminal(Ctrl+Alt+T) from Ubuntu.
- Type in the command in the terminal window: sudo update-grub.
- Hit Enter Key.
- Type in your sudo password when prompt to execute your command.
What is Grub rescue mode in Linux?
grub rescue>: This is the mode when GRUB 2 is unable to find the GRUB folder or its contents are missing/corrupted. The GRUB 2 folder contains the menu, modules and stored environmental data. GRUB: Just “GRUB” nothing else indicates GRUB 2 failed to find even the most basic information needed to boot the system.
Why does grub not boot after deleting Linux partition?
If that doesn’t work, try to boot from an Ubuntu USB (if you have access to another pc to make an bootable USB) and install, you will be prompted with a menu where you can create and edit partitions. Make a new partition for Linux. And then install. After that you should be able to use GRUB again.
How to delete the Grub EFI boot entry?
Manually delete the GRUB EFI boot entry and/or set the Windows bootloader to the first position before you get rid of Ubuntu. This answer to a similar question explains the process for deleting it in Windows. To perform this from Ubuntu, the efibootmgr tool can be useful. Run :- to delete entry XXX.
What should I do when I boot from Grub?
You’ll most likely end up in a GRUB command line prompt on the next boot, from where you’ll have to boot to Windows and delete the GRUB EFI Firmware entry or change the order to put the Windows bootloader in the first place. Here is a similar question that can help in this case.
There might be cases where even when you still have both OS on your laptop. In this case, both Ubuntu and Windows 10 partitions are intact. Still, you may face the problem, since the Grub menu doesn’t show the Windows boot option. In such cases, there is quite a simple fix to bring back Windows Boot Option into the OS Selection menu: